Crystal structure of Staudtienic acid, a diterpenoid from Staudtia kamerunensis Warb. (Myristicaceae)

Tonga Lembe, J.; Mphahlele, P.M.; Kamdem Kengne, M.H.; Jiyane, P.; Djuidje Fotsing, M.C.; Ardene, C.; Mmutlane, E.M.; Ndinteh, D.T.

doi:10.1107/S2056989024005000

research communications

CRYSTALLOGRAPHIC
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ISSN: 2056-9890

Volume 80| Part 8| August 2024| Pages 878-881

https://doi.org/10.1107/S2056989024005000

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Crystal structure of Staudtienic acid, a diterpenoid from Staudtia kamerunensis Warb. (Myristicaceae)

^aDrug Discovery and Smart Molecules Research Laboratory, Department of Chemical, Sciences, University of Johannesburg, PO Box 17011, Doornfontein, Johannesburg 2028, South Africa, ^bCentre for Natural Product Research (CNPR), Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa, and ^cResearch Centre for Synthesis and Catalysis, Department of Chemical Sciences, University of Johannesburg-Kingsway Campus, Auckland Park 2008, South Africa
^*Correspondence e-mail: cardene@uj.ac.za, dndinteh@uj.ac.za

Edited by G. Diaz de Delgado, Universidad de Los Andes Mérida, Venezuela (Received 3 August 2023; accepted 28 May 2024; online 19 July 2024)

This title compound, C₂₀H₂₆O₂, was isolated from the benzene fraction of the stem bark of Staudtia kamerunensis Warb. (Myristicaceae) using column chromatography techniques over silica gel. The compound was fully characterized by single-crystal X-ray diffraction, one and two-dimensional NMR spectroscopy, IR and MS spectrometry. The compound has two fused cyclohexane rings attached to a benzene ring, with a carboxylic acid on C-4. This cyclohexene ring has a chair conformation while the other adopts a half-chair conformation. The benzene ring is substituted with a propenyl moiety. The structure is characterized by intermolecular O—H⋯O hydrogen bonds, two C—H⋯O intramolecular hydrogen bonds and two C—H⋯π interactions. The molecular structure confirms previous studies carried out by spectroscopic techniques.

Keywords: crystal structure; Staudtia kamerunensis; Staudtienic acid; Myristicaceae; hydrogen bonding.

CCDC reference: 2358697

1. Chemical context

Diterpenoids are secondary metabolites mainly obtained from plant species but that can also originate from marine species (Hanson, 2009 ).

The biological importance of diterpenoids is notable. For example, Clerodanes' diterpenoids are compounds isolated from several plant sources that have been reported to possess very good antifeedant activity against certain plant worms such as the tobacco cutworm (Spodoplera litura) and certain locusts such as the African desert locust (Schisticerea gregoria). They are reported to possess antiviral, antitumour and antibiotic properties, among many others (Merritt & Ley, 1992 ). Diterpenoids isolated from Salva multicaulis were reported with significant antituberculosis activity (Ulubelen et al., 1999 ). Paclitaxel, a diterpenoid isolated from the Taxus genus and which is used in cancer therapy, is recognised as one of the most successful so far in that category (Zhu & Chen, 2019 ); forskolin, found in the roots of Coleus forskohlii, is a good cardioprotective compound (Jagtap et al., 2011 ).

Natural product research has gained more attention due to the failure of other drug discovery techniques to supply lead compounds to face the threatening rise of resistance among cancerous strains, bacteria cells, etc. (Butler, 2004 ). The extraction of various compounds in different parts of specific plant species has allowed the isolation of compounds with interesting biological activities, such as diterpenoids, which have been associated with many therapeutic functions: analgesic, anti-inflammatory, anticarcinogenic, etc. (Sun et al., 2006 ).

The objectives of this study were, on one hand, to chromatographically separate and describe the secondary metabolites responsible for the pharmaceutical activities observed during the use of Staudtia kamerunensis Warb. (Myristicaceae) in folkloric medicine. Pharmacological studies on the plant highlighted its antibacterial properties. Analysis against twelve Gram-negative and Gram-positive microbial strains of the ethyl acetate extract of the stem bark of the specie revealed significant antimicrobial activity, with the lowest MIC being 15.625 µg mL⁻¹ (Tonga et al., 2022 ). Crystals of Staudtienic acid, isolated from the stem bark, were analysed by single crystal X-ray diffraction to confirm the structure and the stereochemistry of the compound that had been previously published by Noumbissie and collaborators (Noumbissie et al., 1992 ). Phytochemists have widely used single-crystal X-ray diffraction to confirm the structures of compounds that were previously characterized using spectroscopic methods (Ahmad et al., 2016 ; Simard et al., 2014 ; Adelekan et al., 2008 ).

We herein report for the first time details of the single-crystal X-ray structure determination of (1S,4aS,10aR)-7-allyl-1,4a-dimethyl-1,2,3,4,4a,9,10,10a-octahydrophenanthrene-1-carboxylic acid (Staudtienic acid).

2. Structural commentary

Plant material was processed as described below, resulting in the title diterpenoid. The title compound crystallizes in the orthorhombic space group P2₁2₁2 (No. 18) with two independent molecules in the asymmetric unit (Fig. 1). Staudtienic acid comprises two fused six-membered rings attached to a benzene. A representation of the molecule with Mercury (Mercury 2022.3.0; Macrae et al., 2020 ) gives the spatial disposition of the two cyclohexane rings. Ring A (the ring with the carboxylic acid) adopts a chair conformation, and ring B adopts a half-chair conformation. The half-chair conformation is probably adopted to avoid steric hindrance between the methyl groups and the carboxylic acid. The crystal structure confirmed the NOE data of the compound previously described by Noumbissie and collaborators (Noumbissie et al., 1992).

Figure 1
The two independent molecules of the title compound shown with 50% probability ellipsoids.

The structure was analysed for unusual geometrical parameters using Mogul (Bruno et al., 2004 ). Three unusual structural features presented for this material were analysed, relating to the angle around the atom C2. Three angles were classified as unusual as follows: C3—C2—C1 = 104.7 (3)°, C4—C2—C1 = 111.3 (3)° and C8—C2—C1 = 114.6 (3)°. These bond angles deviate from the standard tetrahedral geometry. The most likely reason for this is probably the presence of the OH groups bonded to C1 that are involved in hydrogen bonding. These may cause small distortions resulting in deviations in the angles around C2.

The propenyl moiety of Molecule A is disordered over two positions (see Fig. 1 for numbering), with the major disorder component residing on C19A [66.9 (11) %] and the minor disorder component residing on C19B [33.1 (11) %]. Atom H1 was also found to be disordered over two positions, and each atom was assigned a 50% occupancy over O1 and O2. This approach was used as the data were insufficient to determine more precisely the positions of the H atoms from the electron-density map, to place it onto residual electron density, and to refine it to obtain a better percentage occupancy.

3. Supramolecular features

Several forms of hydrogen bonding are present in this structure, as shown in Table 1. The packing of the structure is consolidated by classical O—H⋯O hydrogen bonds as well as by two C—H⋯O intermolecular hydrogen bonds and two C—H⋯π interactions. Each crystallographically independent molecule is connected to another of the same type related by the symmetry operation 1 − x, 1 − y, z. In terms of graph sets (Etter et al., 1990 ), this motif is represented by the symbol R₂²(8) (see Fig. 2). The two dimers are then connected by C—H⋯O hydrogen bonds, forming an infinite column along the c-axis. The columns are connected to similar columns by van der Waals interactions with molecules related by $[{1\over 2}]$ + x, $[{1\over 2}]$ − y, 1 − z and $[{1\over 2}]$ − x, − $[{1\over 2}]$ + y, 1 − z. The most illustrative view of the packing arrangement of the title compound is the view down the c axis shown in Fig. 3.

Table 1
Hydrogen-bond geometry (Å, °)

Cg3 and Cg6 are the centroids of the C12A–C17A and C12–C17 rings, respectively.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯O1ⁱ	0.87 (2)	1.88 (3)	2.720 (5)	161 (8)
O2—H2⋯O2ⁱ	0.87 (2)	1.82 (3)	2.656 (5)	162 (7)
O1A—H1A⋯O2Aⁱ	0.87 (2)	1.78 (2)	2.652 (3)	174 (4)
C10A—H10B⋯O2A	0.99	2.51	2.917 (4)	104
C10—H10D⋯O1	0.99	2.58	2.969 (4)	104
C4—H4B⋯Cg3ⁱⁱ	0.99	3.00	3.978 (4)	170
C4A—H4AB⋯Cg6ⁱⁱⁱ	0.99	2.90	3.863 (4)	165
Symmetry codes: (i) ; (ii) $[x+{\script{1\over 2}}, -y+{\script{1\over 2}}, -z+1]$ ; (iii) $[x-{\script{1\over 2}}, -y+{\script{1\over 2}}, -z+1]$ .

Figure 2
The ring motif of the hydrogen bond between a pair of one of the independent molecules. Hydrogen bonds are denoted as red dotted lines. The graph-set symbol is indicated in the centre of the hydrogen bonding ring; only heteroatoms have been labelled. Symmetry codes: (i) −x + 1, −y + 1, z.

Figure 3
The packing of the title compound viewed down the c axis. Hydrogen-bonding contacts are shown in light blue.

4. Database survey

The structure was thoroughly validated using PLATON (Spek, 2020 ). A search was also performed in the Cambridge Structural Database (CSD Version 5.44 2023.1, March 2023 update; Groom et al., 2016 ), and it was established that this structure had not been previously published or deposited.

A search in the CSD for organic compounds with the backbone of two fused rings attached to a benzene revealed 1390 hits. When the propenyl substituent of the benzene ring is introduced, the number of hits is reduced to four [refcodes LATPOP (Zhu et al., 2022 ), LAPHOA (Hitchcock et al., 2005 ), MIXFUX (Ye et al., 2019 ) and OVAQIN (Green et al., 2016 )]. When the carboxylic functional group search is introduced at position C4 of the cyclohexane, the number of search hits is reduced to zero.

5. Synthesis and crystallization

Plant Material. The stem bark of this plant species was collected from Minkam Mengale Menkom, a location in the South region of Cameroon. A voucher specimen is in deposit there under the number 49184 HNC.

Extraction and Isolation. Extraction and isolation were carried out as described by Noumbissie and collaborators (Noumbissie et al., 1992). Briefly, after collection, the sample was dried and ground to yield a powder of 15.79 Kg. A Soxhlet apparatus was used to extract the stem bark using ethyl acetate, and the liquor obtained was evaporated using a rotary evaporator under reduced pressure. A residue of mass 550.12 grams was obtained, and 250 g was partitioned using benzene (C₆H₆) to obtain 41.96 g (yield 41.86, 16.74%) of the sample. The latter was loaded with 500 g of silica, and elution was done with a gradient of polarity starting with benzene, then a mixture of benzene and petroleum ether, then petroleum ether. The final sample was obtained from a mixture of 60% petroleum ether in benzene (yield: 80.22 mg, 0.19%)

6. Refinement

The systematic absences in the diffraction data were uniquely consistent with the space group P2₁2₁2 (No. 18) determined by XPREP (Bruker, 2014 ), which yielded chemically reasonable and computationally stable results of refinement (Sheldrick, 2015a ,b ).

A successful solution by Intrinsic phasing methods (SHELXT; Sheldrick, 2015a) provided all non-hydrogen atoms from the E-map. The remaining hydrogen atoms were located in an alternating series of least-squares cycles and visualization of the difference-Fourier map. All non-hydrogen atoms were refined with anisotropic displacement coefficients. All hydrogen atoms connected to C atoms were included in the structure-factor calculation at idealized positions and were allowed to ride on the neighbouring atoms with relative isotropic displacement coefficients. Two symmetry-independent molecules are in the asymmetric unit as shown in Fig. 1.

The compound crystallized in a chiral space group and the Flack x parameter was determined using 1758 quotients (Parsons et al., 2013 ). However, since the data were collected using Mo radiation, the absolute structure could not be reliably determined. In addition, the crystals used for the data collection diffracted weakly. Attempts were made to find crystal structures of similar compounds where the structural chirality was already known, but these attempts were unsuccessful, as no hits could be found in the CSD.

The final least-squares refinement of 420 parameters against 8260 reflections resulted in residuals R (based on F² for I≥2σ) and wR (based on F² for all data) of 0.0522 and 0.1339, respectively. The final difference-Fourier map was basically featureless. The structure was validated using PLATON (Spek, 2020). Crystal data, data collection and structure refinement details are summarized in Table 2.

Table 2
Experimental details

Crystal data
Chemical formula	C₂₀H₂₆O₂
M_r	298.41
Crystal system, space group	Orthorhombic, P2₁2₁2
Temperature (K)	100
a, b, c (Å)	18.396 (3), 20.248 (4), 8.9338 (16)
V (Å³)	3327.8 (10)
Z	8
Radiation type	Mo Kα
μ (mm⁻¹)	0.08
Crystal size (mm)	0.75 × 0.16 × 0.06

Data collection
Diffractometer	Bruker APEXII CCD
Absorption correction	Multi-scan (SADABS; Krause et al., 2015 )
T_min, T_max	0.670, 0.746
No. of measured, independent and observed [I > 2σ(I)] reflections	30395, 8260, 5374
R_int	0.087
(sin θ/λ)_max (Å⁻¹)	0.667

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.055, 0.134, 1.02
No. of reflections	8260
No. of parameters	420
No. of restraints	20
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρ_max, Δρ_min (e Å⁻³)	0.35, −0.25
Absolute structure	Flack x determined using 1758 quotients [(I⁺)−(I⁻)]/[(I⁺)+(I⁻)] (Parsons et al., 2013)
Absolute structure parameter	−1.0 (9)
Computer programs: APEX2 and SAINT (Bruker, 2014), SHELXT (Sheldrick, 2015a), SHELXL2019/2 (Sheldrick, 2015b) and OLEX2 (Dolomanov et al., 2009 ).

Supporting information

CCDC reference: 2358697

Crystal structure: contains datablock I. DOI: https://doi.org/10.1107/S2056989024005000/dj2072sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989024005000/dj2072Isup2.hkl

Supporting information file. DOI: https://doi.org/10.1107/S2056989024005000/dj2072Isup3.cml

checkCIF report

Computing details top

(1S,4aS,10aR)-1,4a-Dimethyl-7-(prop-2-en-1-yl)-1,2,3,4,4a,9,10,10a-octahydrophenanthrene-1-carboxylic acid top

Crystal data top

C₂₀H₂₆O₂	D_x = 1.191 Mg m⁻³
M_r = 298.41	Mo Kα radiation, λ = 0.71073 Å
Orthorhombic, P2₁2₁2	Cell parameters from 2900 reflections
a = 18.396 (3) Å	θ = 2.3–21.4°
b = 20.248 (4) Å	µ = 0.08 mm⁻¹
c = 8.9338 (16) Å	T = 100 K
V = 3327.8 (10) Å³	Rod, colourless
Z = 8	0.75 × 0.16 × 0.06 mm
F(000) = 1296

Data collection top

Bruker APEXII CCD diffractometer	5374 reflections with I > 2σ(I)
φ and ω scans	R_int = 0.087
Absorption correction: multi-scan (SADABS; Krause et al., 2015)	θ_max = 28.3°, θ_min = 2.3°
T_min = 0.670, T_max = 0.746	h = −24→24
30395 measured reflections	k = −26→27
8260 independent reflections	l = −11→11

Refinement top

Refinement on F²	Hydrogen site location: mixed
Least-squares matrix: full	H atoms treated by a mixture of independent and constrained refinement
R[F² > 2σ(F²)] = 0.055	w = 1/[σ²(F_o²) + (0.057P)² + 0.2719P] where P = (F_o² + 2F_c²)/3
wR(F²) = 0.134	(Δ/σ)_max < 0.001
S = 1.02	Δρ_max = 0.35 e Å⁻³
8260 reflections	Δρ_min = −0.25 e Å⁻³
420 parameters	Absolute structure: Flack x determined using 1758 quotients [(I⁺)-(I^-)]/[(I⁺)+(I^-)] (Parsons et al., 2013)
20 restraints	Absolute structure parameter: −1.0 (9)
Primary atom site location: structure-invariant direct methods

Special details top

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq	Occ. (<1)
O1	0.56424 (13)	0.46675 (12)	0.7674 (3)	0.0332 (6)
H1	0.5190 (18)	0.480 (4)	0.774 (9)	0.050*	0.5
O2	0.55451 (13)	0.45701 (11)	0.5195 (3)	0.0284 (6)
H2	0.521 (4)	0.485 (3)	0.540 (8)	0.043*	0.5
C1	0.58554 (18)	0.44326 (15)	0.6431 (4)	0.0242 (7)
C2	0.65409 (18)	0.40062 (15)	0.6393 (4)	0.0248 (7)
C3	0.71745 (19)	0.44981 (18)	0.6655 (4)	0.0340 (9)
H3A	0.718685	0.482103	0.583872	0.051*
H3B	0.763564	0.425609	0.668450	0.051*
H3C	0.710142	0.472805	0.760888	0.051*
C4	0.66498 (19)	0.36895 (17)	0.4844 (4)	0.0297 (8)
H4A	0.658364	0.403283	0.406667	0.036*
H4B	0.715551	0.352570	0.476945	0.036*
C5	0.6134 (2)	0.31232 (17)	0.4524 (4)	0.0318 (8)
H5A	0.626279	0.292022	0.355183	0.038*
H5B	0.563210	0.329632	0.444528	0.038*
C6	0.6161 (2)	0.25967 (17)	0.5745 (4)	0.0317 (8)
H6A	0.664588	0.238388	0.573209	0.038*
H6B	0.579441	0.225281	0.552315	0.038*
C7	0.60174 (18)	0.28782 (16)	0.7327 (4)	0.0266 (8)
C8	0.65639 (18)	0.34497 (15)	0.7594 (4)	0.0248 (7)
H8	0.705269	0.324129	0.746452	0.030*
C9	0.52197 (18)	0.31055 (17)	0.7437 (4)	0.0301 (8)
H9A	0.513496	0.330801	0.841793	0.045*
H9B	0.489747	0.272387	0.731479	0.045*
H9C	0.511930	0.342923	0.664809	0.045*
C10	0.6548 (2)	0.36695 (17)	0.9240 (4)	0.0309 (8)
H10C	0.684534	0.407317	0.936953	0.037*
H10D	0.604316	0.377093	0.954461	0.037*
C11	0.6850 (2)	0.31163 (19)	1.0201 (4)	0.0371 (9)
H11C	0.737941	0.307626	1.001996	0.045*
H11D	0.677905	0.322860	1.126967	0.045*
C12	0.6492 (2)	0.24637 (18)	0.9880 (4)	0.0341 (9)
C13	0.61215 (19)	0.23419 (17)	0.8535 (5)	0.0324 (8)
C14	0.5810 (2)	0.17213 (18)	0.8346 (5)	0.0416 (10)
H14	0.555181	0.162760	0.745003	0.050*
C15	0.5869 (2)	0.12301 (19)	0.9450 (6)	0.0479 (11)
H15	0.565106	0.081078	0.928701	0.057*
C16	0.6239 (2)	0.1348 (2)	1.0767 (5)	0.0474 (11)
C17	0.6539 (2)	0.19641 (19)	1.0967 (4)	0.0429 (10)
H17	0.678779	0.205523	1.187577	0.051*
C18	0.6342 (3)	0.0809 (2)	1.1954 (5)	0.0614 (14)
H18E	0.642602	0.038240	1.143999	0.074*
H18F	0.678417	0.091157	1.254243	0.074*
C19	0.5741 (3)	0.0733 (2)	1.2969 (6)	0.0616 (14)
H19	0.527301	0.069147	1.252872	0.074*
C20	0.5768 (3)	0.0716 (3)	1.4410 (6)	0.0705 (15)
H20E	0.622148	0.075599	1.490870	0.085*
H20F	0.533331	0.066420	1.497293	0.085*
O1A	0.40394 (13)	0.50455 (12)	0.1249 (3)	0.0295 (6)
H1A	0.4424 (15)	0.5296 (17)	0.119 (4)	0.044*
O2A	0.47966 (12)	0.42012 (12)	0.0856 (3)	0.0310 (6)
C1A	0.41645 (18)	0.44294 (16)	0.1014 (3)	0.0239 (7)
C2A	0.35119 (18)	0.39732 (16)	0.0836 (4)	0.0240 (7)
C3A	0.34903 (19)	0.38042 (17)	−0.0849 (4)	0.0289 (8)
H3AA	0.339858	0.420707	−0.142653	0.043*
H3AB	0.310110	0.348443	−0.103780	0.043*
H3AC	0.395753	0.361376	−0.115109	0.043*
C4A	0.27859 (17)	0.43218 (17)	0.1205 (4)	0.0248 (7)
H4AA	0.278072	0.475876	0.070739	0.030*
H4AB	0.238208	0.405831	0.078033	0.030*
C5A	0.26492 (18)	0.44198 (17)	0.2872 (4)	0.0268 (8)
H5AA	0.215456	0.460090	0.302038	0.032*
H5AB	0.300194	0.474431	0.327153	0.032*
C6A	0.27216 (17)	0.37731 (16)	0.3734 (4)	0.0258 (7)
H6AA	0.233167	0.346746	0.341191	0.031*
H6AB	0.265497	0.386121	0.481498	0.031*
C7A	0.34653 (17)	0.34383 (15)	0.3490 (4)	0.0218 (7)
C8A	0.35657 (17)	0.33317 (16)	0.1781 (3)	0.0223 (7)
H8A	0.313473	0.306353	0.147075	0.027*
C9A	0.40633 (18)	0.38853 (17)	0.4169 (4)	0.0275 (8)
H9AA	0.454279	0.371722	0.388055	0.041*
H9AB	0.402091	0.388446	0.526269	0.041*
H9AC	0.400462	0.433702	0.379449	0.041*
C10A	0.42229 (18)	0.28852 (16)	0.1463 (4)	0.0278 (7)
H10A	0.431446	0.286469	0.037178	0.033*
H10B	0.466155	0.306707	0.195500	0.033*
C11A	0.4064 (2)	0.21939 (17)	0.2065 (4)	0.0331 (9)
H11A	0.368715	0.198306	0.143358	0.040*
H11B	0.451019	0.192244	0.199876	0.040*
C12A	0.38058 (18)	0.22087 (17)	0.3665 (4)	0.0270 (8)
C13A	0.35080 (18)	0.27748 (15)	0.4319 (4)	0.0239 (7)
C14A	0.32951 (18)	0.27379 (16)	0.5820 (4)	0.0276 (8)
H14A	0.309260	0.311797	0.628374	0.033*
C15A	0.33707 (19)	0.21632 (17)	0.6654 (4)	0.0310 (8)
H15A	0.322021	0.215635	0.767102	0.037*
C16A	0.36640 (19)	0.15989 (17)	0.6013 (4)	0.0312 (8)
C17A	0.38702 (19)	0.16302 (17)	0.4524 (4)	0.0314 (8)
H17A	0.406303	0.124501	0.406476	0.038*
C18A	0.3772 (3)	0.0960 (2)	0.6893 (5)	0.0479 (11)
H18A	0.365848	0.058535	0.622049	0.057*	0.669 (11)
H18B	0.429247	0.092575	0.716117	0.057*	0.669 (11)
H18C	0.332193	0.069420	0.680638	0.057*	0.331 (11)
H18D	0.416742	0.070588	0.641157	0.057*	0.331 (11)
C19A	0.3349 (3)	0.0880 (2)	0.8249 (6)	0.0337 (17)	0.669 (11)
H19A	0.283597	0.088146	0.813523	0.040*	0.669 (11)
C19B	0.3942 (7)	0.1029 (7)	0.8450 (8)	0.061 (5)	0.331 (11)
H19B	0.437014	0.127386	0.866117	0.073*	0.331 (11)
C20A	0.3597 (3)	0.0805 (2)	0.9620 (5)	0.0525 (12)
H20A	0.410601	0.080027	0.979977	0.063*	0.669 (11)
H20B	0.326695	0.075693	1.043019	0.063*	0.669 (11)
H20C	0.316391	0.055587	0.949704	0.063*	0.331 (11)
H20D	0.377897	0.089238	1.059547	0.063*	0.331 (11)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
O1	0.0327 (14)	0.0355 (14)	0.0313 (14)	0.0117 (11)	0.0014 (12)	−0.0021 (12)
O2	0.0278 (14)	0.0245 (12)	0.0328 (14)	0.0044 (10)	−0.0060 (11)	0.0023 (11)
C1	0.0232 (17)	0.0220 (16)	0.0274 (18)	−0.0009 (13)	0.0030 (16)	0.0034 (15)
C2	0.0224 (16)	0.0251 (16)	0.0270 (17)	0.0038 (14)	0.0012 (16)	0.0028 (15)
C3	0.0244 (18)	0.036 (2)	0.042 (2)	−0.0023 (15)	−0.0028 (17)	0.0071 (18)
C4	0.0251 (19)	0.0339 (19)	0.0299 (19)	0.0088 (15)	0.0068 (16)	0.0064 (16)
C5	0.035 (2)	0.0336 (19)	0.0266 (19)	0.0103 (16)	0.0044 (17)	−0.0039 (16)
C6	0.033 (2)	0.0258 (17)	0.037 (2)	0.0051 (14)	0.0025 (17)	−0.0009 (16)
C7	0.0235 (18)	0.0260 (17)	0.0303 (19)	0.0057 (14)	0.0051 (15)	0.0031 (16)
C8	0.0211 (17)	0.0275 (17)	0.0259 (17)	0.0090 (14)	0.0009 (15)	0.0008 (15)
C9	0.0252 (18)	0.0271 (17)	0.038 (2)	0.0021 (14)	0.0028 (17)	0.0026 (16)
C10	0.032 (2)	0.0334 (19)	0.0271 (18)	0.0059 (16)	0.0001 (17)	0.0010 (16)
C11	0.041 (2)	0.044 (2)	0.026 (2)	0.0107 (17)	0.0043 (17)	0.0041 (18)
C12	0.037 (2)	0.0344 (19)	0.031 (2)	0.0142 (17)	0.0090 (19)	0.0086 (16)
C13	0.0243 (18)	0.0304 (18)	0.043 (2)	0.0086 (15)	0.0133 (18)	0.0082 (17)
C14	0.033 (2)	0.034 (2)	0.058 (3)	0.0050 (16)	0.012 (2)	0.009 (2)
C15	0.041 (2)	0.0275 (19)	0.075 (3)	0.0024 (17)	0.020 (2)	0.013 (2)
C16	0.056 (3)	0.043 (2)	0.044 (2)	0.019 (2)	0.023 (2)	0.014 (2)
C17	0.052 (3)	0.042 (2)	0.034 (2)	0.020 (2)	0.014 (2)	0.0077 (19)
C18	0.080 (4)	0.047 (3)	0.057 (3)	0.019 (2)	0.024 (3)	0.017 (2)
C19	0.054 (3)	0.068 (3)	0.062 (3)	0.005 (2)	0.009 (3)	0.028 (3)
C20	0.069 (4)	0.088 (4)	0.055 (3)	0.003 (3)	0.012 (3)	0.021 (3)
O1A	0.0276 (13)	0.0253 (12)	0.0356 (14)	−0.0042 (10)	0.0028 (12)	0.0012 (11)
O2A	0.0210 (12)	0.0325 (13)	0.0393 (14)	−0.0003 (10)	0.0038 (11)	−0.0017 (12)
C1A	0.0219 (17)	0.0304 (18)	0.0195 (17)	0.0009 (13)	0.0002 (14)	0.0004 (14)
C2A	0.0223 (17)	0.0266 (16)	0.0232 (17)	−0.0010 (14)	0.0006 (15)	−0.0009 (14)
C3A	0.0275 (18)	0.0347 (18)	0.0246 (17)	−0.0007 (15)	0.0009 (16)	−0.0009 (16)
C4A	0.0200 (16)	0.0257 (16)	0.0287 (19)	0.0009 (13)	−0.0021 (15)	0.0001 (15)
C5A	0.0207 (17)	0.0304 (19)	0.0291 (18)	0.0040 (13)	0.0034 (15)	−0.0014 (16)
C6A	0.0234 (17)	0.0266 (17)	0.0276 (18)	0.0010 (13)	0.0030 (15)	−0.0030 (16)
C7A	0.0205 (16)	0.0224 (15)	0.0224 (16)	−0.0020 (13)	−0.0015 (15)	−0.0015 (14)
C8A	0.0191 (16)	0.0245 (16)	0.0232 (17)	−0.0024 (13)	−0.0003 (14)	−0.0018 (14)
C9A	0.0273 (18)	0.0280 (17)	0.0273 (18)	−0.0046 (14)	−0.0036 (15)	0.0008 (15)
C10A	0.0260 (18)	0.0303 (18)	0.0272 (17)	0.0050 (14)	0.0028 (16)	−0.0027 (16)
C11A	0.037 (2)	0.0276 (18)	0.035 (2)	0.0073 (15)	0.0019 (17)	0.0008 (16)
C12A	0.0220 (17)	0.0272 (17)	0.0319 (19)	−0.0016 (13)	0.0004 (16)	0.0004 (16)
C13A	0.0183 (16)	0.0262 (16)	0.0271 (17)	−0.0031 (13)	−0.0042 (15)	−0.0011 (14)
C14A	0.0266 (19)	0.0256 (17)	0.0307 (19)	−0.0042 (14)	0.0007 (15)	−0.0047 (15)
C15A	0.031 (2)	0.0330 (19)	0.0287 (19)	−0.0090 (15)	0.0031 (16)	0.0031 (16)
C16A	0.031 (2)	0.0272 (18)	0.035 (2)	−0.0047 (14)	0.0006 (16)	0.0051 (16)
C17A	0.0265 (18)	0.0242 (17)	0.044 (2)	−0.0008 (14)	0.0003 (17)	0.0014 (17)
C18A	0.063 (3)	0.032 (2)	0.048 (2)	0.0002 (19)	0.010 (2)	0.0080 (19)
C19A	0.039 (4)	0.022 (3)	0.040 (3)	−0.005 (2)	0.007 (3)	0.000 (2)
C19B	0.055 (9)	0.066 (9)	0.063 (6)	−0.024 (7)	−0.015 (6)	0.026 (6)
C20A	0.073 (3)	0.041 (2)	0.044 (2)	−0.007 (2)	−0.005 (2)	0.003 (2)

Geometric parameters (Å, º) top

O1—H1	0.87 (2)	C1A—C2A	1.523 (5)
O1—C1	1.270 (4)	C2A—C3A	1.544 (5)
O2—H2	0.87 (2)	C2A—C4A	1.546 (4)
O2—C1	1.274 (4)	C2A—C8A	1.552 (4)
C1—C2	1.529 (4)	C3A—H3AA	0.9800
C2—C3	1.551 (5)	C3A—H3AB	0.9800
C2—C4	1.538 (5)	C3A—H3AC	0.9800
C2—C8	1.557 (5)	C4A—H4AA	0.9900
C3—H3A	0.9800	C4A—H4AB	0.9900
C3—H3B	0.9800	C4A—C5A	1.524 (5)
C3—H3C	0.9800	C5A—H5AA	0.9900
C4—H4A	0.9900	C5A—H5AB	0.9900
C4—H4B	0.9900	C5A—C6A	1.525 (5)
C4—C5	1.516 (5)	C6A—H6AA	0.9900
C5—H5A	0.9900	C6A—H6AB	0.9900
C5—H5B	0.9900	C6A—C7A	1.542 (4)
C5—C6	1.526 (5)	C7A—C8A	1.553 (4)
C6—H6A	0.9900	C7A—C9A	1.548 (4)
C6—H6B	0.9900	C7A—C13A	1.536 (4)
C6—C7	1.547 (5)	C8A—H8A	1.0000
C7—C8	1.551 (5)	C8A—C10A	1.536 (4)
C7—C9	1.541 (5)	C9A—H9AA	0.9800
C7—C13	1.543 (5)	C9A—H9AB	0.9800
C8—H8	1.0000	C9A—H9AC	0.9800
C8—C10	1.536 (5)	C10A—H10A	0.9900
C9—H9A	0.9800	C10A—H10B	0.9900
C9—H9B	0.9800	C10A—C11A	1.528 (5)
C9—H9C	0.9800	C11A—H11A	0.9900
C10—H10C	0.9900	C11A—H11B	0.9900
C10—H10D	0.9900	C11A—C12A	1.507 (5)
C10—C11	1.517 (5)	C12A—C13A	1.398 (5)
C11—H11C	0.9900	C12A—C17A	1.405 (5)
C11—H11D	0.9900	C13A—C14A	1.400 (5)
C11—C12	1.504 (6)	C14A—H14A	0.9500
C12—C13	1.403 (6)	C14A—C15A	1.389 (5)
C12—C17	1.405 (5)	C15A—H15A	0.9500
C13—C14	1.391 (5)	C15A—C16A	1.387 (5)
C14—H14	0.9500	C16A—C17A	1.385 (5)
C14—C15	1.405 (6)	C16A—C18A	1.527 (5)
C15—H15	0.9500	C17A—H17A	0.9500
C15—C16	1.380 (6)	C18A—H18A	0.9900
C16—C17	1.376 (6)	C18A—H18B	0.9900
C16—C18	1.534 (6)	C18A—H18C	0.9900
C17—H17	0.9500	C18A—H18D	0.9900
C18—H18E	0.9900	C18A—C19A	1.448 (6)
C18—H18F	0.9900	C18A—C19B	1.432 (8)
C18—C19	1.439 (7)	C19A—H19A	0.9500
C19—H19	0.9500	C19A—C20A	1.316 (6)
C19—C20	1.289 (7)	C19B—H19B	0.9500
C20—H20E	0.9500	C19B—C20A	1.304 (8)
C20—H20F	0.9500	C20A—H20A	0.9500
O1A—H1A	0.872 (19)	C20A—H20B	0.9500
O1A—C1A	1.286 (4)	C20A—H20C	0.9500
O2A—C1A	1.259 (4)	C20A—H20D	0.9500

C1—O1—H1	118 (5)	C1A—C2A—C8A	113.6 (3)
C1—O2—H2	106 (5)	C3A—C2A—C4A	106.7 (3)
O1—C1—O2	122.5 (3)	C3A—C2A—C8A	110.3 (3)
O1—C1—C2	119.0 (3)	C4A—C2A—C8A	108.7 (3)
O2—C1—C2	118.3 (3)	C2A—C3A—H3AA	109.5
C1—C2—C3	104.7 (3)	C2A—C3A—H3AB	109.5
C1—C2—C4	111.3 (3)	C2A—C3A—H3AC	109.5
C1—C2—C8	114.6 (3)	H3AA—C3A—H3AB	109.5
C3—C2—C8	109.9 (3)	H3AA—C3A—H3AC	109.5
C4—C2—C3	107.8 (3)	H3AB—C3A—H3AC	109.5
C4—C2—C8	108.4 (3)	C2A—C4A—H4AA	108.7
C2—C3—H3A	109.5	C2A—C4A—H4AB	108.7
C2—C3—H3B	109.5	H4AA—C4A—H4AB	107.6
C2—C3—H3C	109.5	C5A—C4A—C2A	114.2 (3)
H3A—C3—H3B	109.5	C5A—C4A—H4AA	108.7
H3A—C3—H3C	109.5	C5A—C4A—H4AB	108.7
H3B—C3—H3C	109.5	C4A—C5A—H5AA	109.3
C2—C4—H4A	108.8	C4A—C5A—H5AB	109.3
C2—C4—H4B	108.8	C4A—C5A—C6A	111.5 (3)
H4A—C4—H4B	107.7	H5AA—C5A—H5AB	108.0
C5—C4—C2	113.8 (3)	C6A—C5A—H5AA	109.3
C5—C4—H4A	108.8	C6A—C5A—H5AB	109.3
C5—C4—H4B	108.8	C5A—C6A—H6AA	109.1
C4—C5—H5A	109.2	C5A—C6A—H6AB	109.1
C4—C5—H5B	109.2	C5A—C6A—C7A	112.6 (3)
C4—C5—C6	111.9 (3)	H6AA—C6A—H6AB	107.8
H5A—C5—H5B	107.9	C7A—C6A—H6AA	109.1
C6—C5—H5A	109.2	C7A—C6A—H6AB	109.1
C6—C5—H5B	109.2	C6A—C7A—C8A	107.8 (3)
C5—C6—H6A	109.0	C6A—C7A—C9A	108.5 (3)
C5—C6—H6B	109.0	C9A—C7A—C8A	112.5 (3)
C5—C6—C7	112.9 (3)	C13A—C7A—C6A	111.2 (3)
H6A—C6—H6B	107.8	C13A—C7A—C8A	110.3 (3)
C7—C6—H6A	109.0	C13A—C7A—C9A	106.6 (3)
C7—C6—H6B	109.0	C2A—C8A—C7A	114.2 (3)
C6—C7—C8	107.7 (3)	C2A—C8A—H8A	104.7
C9—C7—C6	109.4 (3)	C7A—C8A—H8A	104.7
C9—C7—C8	112.6 (3)	C10A—C8A—C2A	116.2 (3)
C9—C7—C13	106.5 (3)	C10A—C8A—C7A	110.9 (3)
C13—C7—C6	111.0 (3)	C10A—C8A—H8A	104.7
C13—C7—C8	109.7 (3)	C7A—C9A—H9AA	109.5
C2—C8—H8	104.5	C7A—C9A—H9AB	109.5
C7—C8—C2	114.6 (3)	C7A—C9A—H9AC	109.5
C7—C8—H8	104.5	H9AA—C9A—H9AB	109.5
C10—C8—C2	116.7 (3)	H9AA—C9A—H9AC	109.5
C10—C8—C7	110.6 (3)	H9AB—C9A—H9AC	109.5
C10—C8—H8	104.5	C8A—C10A—H10A	109.9
C7—C9—H9A	109.5	C8A—C10A—H10B	109.9
C7—C9—H9B	109.5	H10A—C10A—H10B	108.3
C7—C9—H9C	109.5	C11A—C10A—C8A	108.9 (3)
H9A—C9—H9B	109.5	C11A—C10A—H10A	109.9
H9A—C9—H9C	109.5	C11A—C10A—H10B	109.9
H9B—C9—H9C	109.5	C10A—C11A—H11A	109.2
C8—C10—H10C	109.9	C10A—C11A—H11B	109.2
C8—C10—H10D	109.9	H11A—C11A—H11B	107.9
H10C—C10—H10D	108.3	C12A—C11A—C10A	112.1 (3)
C11—C10—C8	108.7 (3)	C12A—C11A—H11A	109.2
C11—C10—H10C	109.9	C12A—C11A—H11B	109.2
C11—C10—H10D	109.9	C13A—C12A—C11A	122.4 (3)
C10—C11—H11C	109.1	C13A—C12A—C17A	119.2 (3)
C10—C11—H11D	109.1	C17A—C12A—C11A	118.4 (3)
H11C—C11—H11D	107.9	C12A—C13A—C7A	122.4 (3)
C12—C11—C10	112.3 (3)	C12A—C13A—C14A	117.8 (3)
C12—C11—H11C	109.1	C14A—C13A—C7A	119.6 (3)
C12—C11—H11D	109.1	C13A—C14A—H14A	119.0
C13—C12—C11	122.0 (3)	C15A—C14A—C13A	122.1 (3)
C13—C12—C17	119.7 (4)	C15A—C14A—H14A	119.0
C17—C12—C11	118.3 (4)	C14A—C15A—H15A	119.7
C12—C13—C7	122.4 (3)	C16A—C15A—C14A	120.5 (3)
C14—C13—C7	120.0 (4)	C16A—C15A—H15A	119.7
C14—C13—C12	117.5 (3)	C15A—C16A—C18A	122.4 (3)
C13—C14—H14	119.2	C17A—C16A—C15A	117.7 (3)
C13—C14—C15	121.5 (4)	C17A—C16A—C18A	119.9 (3)
C15—C14—H14	119.2	C12A—C17A—H17A	118.7
C14—C15—H15	119.5	C16A—C17A—C12A	122.7 (3)
C16—C15—C14	120.9 (4)	C16A—C17A—H17A	118.7
C16—C15—H15	119.5	C16A—C18A—H18A	108.0
C15—C16—C18	121.8 (4)	C16A—C18A—H18B	108.0
C17—C16—C15	117.8 (4)	C16A—C18A—H18C	108.2
C17—C16—C18	120.4 (4)	C16A—C18A—H18D	108.2
C12—C17—H17	118.7	H18A—C18A—H18B	107.3
C16—C17—C12	122.5 (4)	H18C—C18A—H18D	107.3
C16—C17—H17	118.7	C19A—C18A—C16A	117.1 (4)
C16—C18—H18E	108.6	C19A—C18A—H18A	108.0
C16—C18—H18F	108.6	C19A—C18A—H18B	108.0
H18E—C18—H18F	107.6	C19B—C18A—C16A	116.5 (7)
C19—C18—C16	114.6 (4)	C19B—C18A—H18C	108.2
C19—C18—H18E	108.6	C19B—C18A—H18D	108.2
C19—C18—H18F	108.6	C18A—C19A—H19A	116.4
C18—C19—H19	116.5	C20A—C19A—C18A	127.3 (5)
C20—C19—C18	127.1 (6)	C20A—C19A—H19A	116.4
C20—C19—H19	116.5	C18A—C19B—H19B	115.2
C19—C20—H20E	120.0	C20A—C19B—C18A	129.7 (7)
C19—C20—H20F	120.0	C20A—C19B—H19B	115.2
H20E—C20—H20F	120.0	C19A—C20A—H20A	120.0
C1A—O1A—H1A	114 (3)	C19A—C20A—H20B	120.0
O1A—C1A—C2A	117.7 (3)	C19B—C20A—H20C	120.0
O2A—C1A—O1A	122.7 (3)	C19B—C20A—H20D	120.0
O2A—C1A—C2A	119.6 (3)	H20A—C20A—H20B	120.0
C1A—C2A—C3A	104.9 (3)	H20C—C20A—H20D	120.0
C1A—C2A—C4A	112.4 (3)

O1—C1—C2—C3	−71.8 (4)	O1A—C1A—C2A—C8A	−132.5 (3)
O1—C1—C2—C4	172.0 (3)	O2A—C1A—C2A—C3A	−69.5 (4)
O1—C1—C2—C8	48.6 (4)	O2A—C1A—C2A—C4A	175.0 (3)
O2—C1—C2—C3	104.1 (3)	O2A—C1A—C2A—C8A	50.9 (4)
O2—C1—C2—C4	−12.1 (4)	C1A—C2A—C4A—C5A	−75.7 (4)
O2—C1—C2—C8	−135.5 (3)	C1A—C2A—C8A—C7A	72.0 (4)
C1—C2—C4—C5	−74.3 (3)	C1A—C2A—C8A—C10A	−59.2 (4)
C1—C2—C8—C7	70.0 (4)	C2A—C4A—C5A—C6A	−53.0 (4)
C1—C2—C8—C10	−61.5 (4)	C2A—C8A—C10A—C11A	−161.1 (3)
C2—C4—C5—C6	−54.1 (4)	C3A—C2A—C4A—C5A	169.8 (3)
C2—C8—C10—C11	−159.1 (3)	C3A—C2A—C8A—C7A	−170.6 (3)
C3—C2—C4—C5	171.5 (3)	C3A—C2A—C8A—C10A	58.2 (4)
C3—C2—C8—C7	−172.5 (3)	C4A—C2A—C8A—C7A	−54.0 (4)
C3—C2—C8—C10	56.0 (4)	C4A—C2A—C8A—C10A	174.8 (3)
C4—C2—C8—C7	−54.9 (3)	C4A—C5A—C6A—C7A	55.8 (4)
C4—C2—C8—C10	173.6 (3)	C5A—C6A—C7A—C8A	−56.6 (3)
C4—C5—C6—C7	55.1 (4)	C5A—C6A—C7A—C9A	65.4 (3)
C5—C6—C7—C8	−54.6 (4)	C5A—C6A—C7A—C13A	−177.6 (3)
C5—C6—C7—C9	68.1 (4)	C6A—C7A—C8A—C2A	57.0 (3)
C5—C6—C7—C13	−174.7 (3)	C6A—C7A—C8A—C10A	−169.3 (2)
C6—C7—C8—C2	55.9 (3)	C6A—C7A—C13A—C12A	136.7 (3)
C6—C7—C8—C10	−169.7 (3)	C6A—C7A—C13A—C14A	−48.3 (4)
C6—C7—C13—C12	136.5 (4)	C7A—C8A—C10A—C11A	66.2 (4)
C6—C7—C13—C14	−46.9 (4)	C7A—C13A—C14A—C15A	−175.3 (3)
C7—C8—C10—C11	67.5 (4)	C8A—C2A—C4A—C5A	51.0 (4)
C7—C13—C14—C15	−177.4 (3)	C8A—C7A—C13A—C12A	17.2 (4)
C8—C2—C4—C5	52.6 (4)	C8A—C7A—C13A—C14A	−167.8 (3)
C8—C7—C13—C12	17.6 (4)	C8A—C10A—C11A—C12A	−50.6 (4)
C8—C7—C13—C14	−165.9 (3)	C9A—C7A—C8A—C2A	−62.6 (4)
C8—C10—C11—C12	−51.0 (4)	C9A—C7A—C8A—C10A	71.1 (3)
C9—C7—C8—C2	−64.7 (4)	C9A—C7A—C13A—C12A	−105.1 (3)
C9—C7—C8—C10	69.7 (4)	C9A—C7A—C13A—C14A	69.8 (4)
C9—C7—C13—C12	−104.5 (4)	C10A—C11A—C12A—C13A	21.0 (5)
C9—C7—C13—C14	72.0 (4)	C10A—C11A—C12A—C17A	−159.0 (3)
C10—C11—C12—C13	20.5 (5)	C11A—C12A—C13A—C7A	−4.0 (5)
C10—C11—C12—C17	−160.0 (3)	C11A—C12A—C13A—C14A	−179.1 (3)
C11—C12—C13—C7	−3.5 (5)	C11A—C12A—C17A—C16A	178.5 (3)
C11—C12—C13—C14	179.9 (3)	C12A—C13A—C14A—C15A	−0.1 (5)
C11—C12—C17—C16	−179.0 (4)	C13A—C7A—C8A—C2A	178.5 (3)
C12—C13—C14—C15	−0.7 (5)	C13A—C7A—C8A—C10A	−47.7 (3)
C13—C7—C8—C2	176.8 (3)	C13A—C12A—C17A—C16A	−1.4 (5)
C13—C7—C8—C10	−48.7 (3)	C13A—C14A—C15A—C16A	0.0 (5)
C13—C12—C17—C16	0.6 (6)	C14A—C15A—C16A—C17A	−0.5 (5)
C13—C14—C15—C16	0.1 (6)	C14A—C15A—C16A—C18A	178.8 (4)
C14—C15—C16—C17	0.8 (6)	C15A—C16A—C17A—C12A	1.2 (5)
C14—C15—C16—C18	−176.9 (4)	C15A—C16A—C18A—C19A	20.0 (6)
C15—C16—C17—C12	−1.1 (6)	C15A—C16A—C18A—C19B	−32.9 (7)
C15—C16—C18—C19	−84.1 (6)	C16A—C18A—C19A—C20A	−119.2 (5)
C16—C18—C19—C20	−129.7 (6)	C16A—C18A—C19B—C20A	121.4 (13)
C17—C12—C13—C7	177.0 (3)	C17A—C12A—C13A—C7A	175.9 (3)
C17—C12—C13—C14	0.3 (5)	C17A—C12A—C13A—C14A	0.8 (5)
C17—C16—C18—C19	98.3 (6)	C17A—C16A—C18A—C19A	−160.7 (4)
C18—C16—C17—C12	176.6 (4)	C17A—C16A—C18A—C19B	146.4 (6)
O1A—C1A—C2A—C3A	107.0 (3)	C18A—C16A—C17A—C12A	−178.1 (3)
O1A—C1A—C2A—C4A	−8.5 (4)

Hydrogen-bond geometry (Å, º) top

Cg3 and Cg6 are the centroids of the C12A–C17A and C12–C17 rings, respectively.

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1···O1ⁱ	0.87 (2)	1.88 (3)	2.720 (5)	161 (8)
O2—H2···O2ⁱ	0.87 (2)	1.82 (3)	2.656 (5)	162 (7)
O1A—H1A···O2Aⁱ	0.87 (2)	1.78 (2)	2.652 (3)	174 (4)
C10A—H10B···O2A	0.99	2.51	2.917 (4)	104
C10—H10D···O1	0.99	2.58	2.969 (4)	104
C4—H4B···Cg3ⁱⁱ	0.99	3.00	3.978 (4)	170
C4A—H4AB···Cg6ⁱⁱⁱ	0.99	2.90	3.863 (4)	165

Symmetry codes: (i) −x+1, −y+1, z; (ii) x+1/2, −y+1/2, −z+1; (iii) x−1/2, −y+1/2, −z+1.

Acknowledgements

We acknowledge the Department of Chemical Sciences for providing the infrastructure to conduct the experiments and the National Research Foundation (NRF) for their financial support.

Funding information

Funding for this research was provided by: National Research Fund (South Africa) (grant No. 1167490).

References

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Volume 80| Part 8| August 2024| Pages 878-881

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research communications\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

Crystal structure of Staudtienic acid, a diterpenoid from Staudtia kamerunensis Warb. (Myristicaceae)

1. Chemical context

2. Structural commentary

3. Supra­molecular features

4. Database survey

5. Synthesis and crystallization

6. Refinement

Supporting information

Acknowledgements

Funding information

References

research communications

3. Supramolecular features