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In the title compound, C16H15NO3S, the benzothia­zole ring system is essentially planar and makes a dihedral angle of 4.5 (2)° with the plane of the attached benzene ring. The 4- and 5-meth­oxy groups are coplanar with the attached benzene ring, while the 2-meth­oxy group is rotated slightly out of the plane [4.8 (3)°].

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807032114/fl2131sup1.cif
Contains datablocks global, I

hkl

Structure factor file (CIF format) https://doi.org/10.1107/S1600536807032114/fl2131Isup2.hkl
Contains datablock I

CCDC reference: 614259

Key indicators

  • Single-crystal X-ray study
  • T = 273 K
  • Mean [sigma](C-C) = 0.003 Å
  • R factor = 0.034
  • wR factor = 0.089
  • Data-to-parameter ratio = 15.5

checkCIF/PLATON results

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Alert level C PLAT066_ALERT_1_C Predicted and Reported Transmissions Identical . ? PLAT322_ALERT_2_C Check Hybridisation of S1 in Main Residue . ?
Alert level G REFLT03_ALERT_4_G Please check that the estimate of the number of Friedel pairs is correct. If it is not, please give the correct count in the _publ_section_exptl_refinement section of the submitted CIF. From the CIF: _diffrn_reflns_theta_max 27.50 From the CIF: _reflns_number_total 3309 Count of symmetry unique reflns 1935 Completeness (_total/calc) 171.01% TEST3: Check Friedels for noncentro structure Estimate of Friedel pairs measured 1374 Fraction of Friedel pairs measured 0.710 Are heavy atom types Z>Si present yes
0 ALERT level A = In general: serious problem 0 ALERT level B = Potentially serious problem 2 ALERT level C = Check and explain 1 ALERT level G = General alerts; check 1 ALERT type 1 CIF construction/syntax error, inconsistent or missing data 1 ALERT type 2 Indicator that the structure model may be wrong or deficient 0 ALERT type 3 Indicator that the structure quality may be low 1 ALERT type 4 Improvement, methodology, query or suggestion 0 ALERT type 5 Informative message, check

Comment top

2-arylbenzothiazole derivatives have been well known for their biological and pharmaceutical activities, such as antitumor, antiviral, antimicrobial activities and potent inhibitory activity (Altanla et al., 1999). Recently, 2-arylbenzothiazole derivatives have also attracted increasing attention due to their application in the area of organic optoelectronic materials, such as second-order nonlinear optical (NLO) materials (Leng et al., 2001), two-photo absorption (TPA) chromophores (Prasad et al., 2001), photoconducting materials (Kalle & Br, 1962), liquid crystals (Kawamoto et al., 2003) and efficient fluorophores (Barbara et al., 1980). The title compound, (I), plays a very important role in the electroactive and photoative materials, which emits blue luminescence in both solid state and organic solution upon by UV-light at ambient temperature.

In the crystal structure of the title molecule, the five-member thiazole ring is almost coplanar with its fused benzene ring, and the dihedral angle between the mean planes of the rings is only 0.3 (1) ° (Fig. 1). The benzothiazole ring is twisted slightly away from the plane of C13—C8 phenyl ring due to the steric hindrance. The dihedral angle between them is 4.5 (2) °. 2-Methoxy group is twisted out of the C13—C8 benzene plane due to the steric interference from the adjacent benzothiazole moiety. The C10—C9—O1—C16 torsion angle is 4.8 (3) °. the other two methoxy groups almost lies in the C8—C13 benzene plane. The bond distances of C7—N1 (1.301 (2) Å) and C1—N1 (1.387 (2) Å), have an average trend, which is a result of π-electron delocalization. Similarly, the bond lengths of C6—S1 (1.7292 (19) Å) and C7—S1 (1.7588 (17) Å) have small difference (Table 1).

In the stacking structure of compound (I), there exists an effective overlap of the phenyl rings between two adjacent molecules (Fig. 2). The shortest separation distance is about 3.502 Å. There are also interactions between C15—H and the benzene ring of adjacent molecules, whose shortest distance is 3.494 Å.

Related literature top

For related literature, see: Kalle & Br (1962); Barbara et al. (1980); Leng et al. (2001); Kannan et al. (2001); Mori et al. (2003); Oren et al. (1999); Altanla et al. (1999); Prasad et al. (2001); Kawamoto et al. (2003).

Experimental top

2-aminothiophenol and 2, 4, 5-trimethoxybenzaldehyde were purchased from Acros and used without further purification. 2-aminothiophenol (1.25 g, 10 mmol) and 2, 4, 5-trimethoxybenzaldehyde (1.96 g, 10 mmol) were dissolved in 20 ml of DMSO under argon atmosphere. The mixture was heated at 473 K for 0.5 h. After cooling, the solution was poured into ice water, and then adjusted the solution to pH 8–9 with 1 N NaHCO3 solution. The precipitate was filtered, washed with a great deal of water several times. After dried under vacuum, the crude product was recrystallized with ethanol. Light green crystal, yield: 90%. 1H NMR (CDCl3, p.p.m.) 8.09 (s, 1H), 8.03 (d, J = 7.2 Hz, 1H), 7.88 (d, J = 7.8 Hz, 1H), 7.45 (t, J = 7.5 Hz, 1H), 7.33 (t, J = 7.2 Hz, 1H), 6.61 (s, 1H), 4.04 (s, 3H), 4.01 (s, 3H), 3.96 (s, 3H). mp = 471–472 K. Anal.Calcd for C16H15O3NS: C, 63.77; H, 5.01; N, 4.65. Found: C, 63.69; H, 4.96; N, 4.62%. MS (FAB): m/e, 301 (M+).

Refinement top

H atoms were placed in idealized positions and constrained to ride on their parent atoms with C—H = 0.93 Å, and with Uiso(H) = 1.2 Ueq(carrier atom).

Structure description top

2-arylbenzothiazole derivatives have been well known for their biological and pharmaceutical activities, such as antitumor, antiviral, antimicrobial activities and potent inhibitory activity (Altanla et al., 1999). Recently, 2-arylbenzothiazole derivatives have also attracted increasing attention due to their application in the area of organic optoelectronic materials, such as second-order nonlinear optical (NLO) materials (Leng et al., 2001), two-photo absorption (TPA) chromophores (Prasad et al., 2001), photoconducting materials (Kalle & Br, 1962), liquid crystals (Kawamoto et al., 2003) and efficient fluorophores (Barbara et al., 1980). The title compound, (I), plays a very important role in the electroactive and photoative materials, which emits blue luminescence in both solid state and organic solution upon by UV-light at ambient temperature.

In the crystal structure of the title molecule, the five-member thiazole ring is almost coplanar with its fused benzene ring, and the dihedral angle between the mean planes of the rings is only 0.3 (1) ° (Fig. 1). The benzothiazole ring is twisted slightly away from the plane of C13—C8 phenyl ring due to the steric hindrance. The dihedral angle between them is 4.5 (2) °. 2-Methoxy group is twisted out of the C13—C8 benzene plane due to the steric interference from the adjacent benzothiazole moiety. The C10—C9—O1—C16 torsion angle is 4.8 (3) °. the other two methoxy groups almost lies in the C8—C13 benzene plane. The bond distances of C7—N1 (1.301 (2) Å) and C1—N1 (1.387 (2) Å), have an average trend, which is a result of π-electron delocalization. Similarly, the bond lengths of C6—S1 (1.7292 (19) Å) and C7—S1 (1.7588 (17) Å) have small difference (Table 1).

In the stacking structure of compound (I), there exists an effective overlap of the phenyl rings between two adjacent molecules (Fig. 2). The shortest separation distance is about 3.502 Å. There are also interactions between C15—H and the benzene ring of adjacent molecules, whose shortest distance is 3.494 Å.

For related literature, see: Kalle & Br (1962); Barbara et al. (1980); Leng et al. (2001); Kannan et al. (2001); Mori et al. (2003); Oren et al. (1999); Altanla et al. (1999); Prasad et al. (2001); Kawamoto et al. (2003).

Computing details top

Data collection: SMART (Siemens, 1996); cell refinement: SAINT (Siemens, 1996); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997a); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997a); molecular graphics: SHELXTL (Sheldrick, 1997b); software used to prepare material for publication: SHELXTL.

Figures top
[Figure 1] Fig. 1. The structure of (I), showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 50% probability level.
[Figure 2] Fig. 2. Part of the crystal packing of (I), showing the intermolecular interactions. All hydrogen atoms have been omitted for clarity.
2-(2,4,5-Trimethoxyphenyl)-1,3-benzothiazole top
Crystal data top
C16H15NO3SZ = 4
Mr = 301.35F(000) = 632
Orthorhombic, P212121Dx = 1.375 Mg m3
Hall symbol: P 2ac 2abMo Kα radiation, λ = 0.71073 Å
a = 6.9897 (6) ŵ = 0.23 mm1
b = 12.6809 (11) ÅT = 273 K
c = 16.4228 (14) ÅBlock, green
V = 1455.6 (2) Å30.18 × 0.12 × 0.08 mm
Data collection top
Siemens SMART CCD area-detector
diffractometer
3309 independent reflections
Radiation source: fine-focus sealed tube2843 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.022
φ and ω scansθmax = 27.5°, θmin = 2.0°
Absorption correction: multi-scan
(SADABS; Sheldrick, 1996)
h = 99
Tmin = 0.960, Tmax = 0.982k = 1615
9473 measured reflectionsl = 2115
Refinement top
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.034H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.089 w = 1/[σ2(Fo2) + (0.047P)2 + 0.0899P]
where P = (Fo2 + 2Fc2)/3
S = 1.03(Δ/σ)max = 0.001
3309 reflectionsΔρmax = 0.20 e Å3
213 parametersΔρmin = 0.18 e Å3
0 restraintsAbsolute structure: Flack (1983)
Primary atom site location: structure-invariant direct methodsAbsolute structure parameter: 0.06 (7)
Crystal data top
C16H15NO3SV = 1455.6 (2) Å3
Mr = 301.35Z = 4
Orthorhombic, P212121Mo Kα radiation
a = 6.9897 (6) ŵ = 0.23 mm1
b = 12.6809 (11) ÅT = 273 K
c = 16.4228 (14) Å0.18 × 0.12 × 0.08 mm
Data collection top
Siemens SMART CCD area-detector
diffractometer
3309 independent reflections
Absorption correction: multi-scan
(SADABS; Sheldrick, 1996)
2843 reflections with I > 2σ(I)
Tmin = 0.960, Tmax = 0.982Rint = 0.022
9473 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.034H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.089Δρmax = 0.20 e Å3
S = 1.03Δρmin = 0.18 e Å3
3309 reflectionsAbsolute structure: Flack (1983)
213 parametersAbsolute structure parameter: 0.06 (7)
0 restraints
Special details top

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

Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
C10.0446 (3)0.79063 (14)0.78838 (11)0.0448 (4)
C20.2035 (3)0.72585 (17)0.77923 (14)0.0592 (5)
C30.3326 (3)0.71829 (18)0.84219 (15)0.0657 (6)
C40.3062 (3)0.77359 (18)0.91380 (15)0.0638 (6)
C50.1498 (3)0.83768 (17)0.92492 (14)0.0590 (5)
C60.0190 (3)0.84597 (14)0.86102 (12)0.0463 (4)
C70.2260 (3)0.87307 (13)0.75684 (10)0.0410 (4)
C80.3898 (2)0.90527 (13)0.70673 (10)0.0399 (4)
C90.5369 (3)0.96957 (14)0.73449 (11)0.0432 (4)
C100.6914 (3)0.99462 (14)0.68413 (11)0.0452 (4)
C110.6967 (3)0.95721 (13)0.60518 (11)0.0423 (4)
C120.5458 (3)0.89504 (14)0.57504 (11)0.0436 (4)
C130.3979 (3)0.86906 (13)0.62575 (10)0.0424 (4)
H130.30000.82630.60620.051*
C140.4136 (3)0.80441 (18)0.46223 (13)0.0669 (6)
H14A0.40390.73960.49210.100*
H14B0.44110.78930.40620.100*
H14C0.29490.84220.46600.100*
C150.9938 (3)1.04209 (18)0.57777 (14)0.0623 (6)
H15A0.94561.11120.59000.093*
H15C1.08781.04700.53530.093*
H15B1.05141.01240.62560.093*
C160.6571 (3)1.07802 (17)0.84273 (12)0.0641 (6)
H16A0.78221.04690.84040.096*
H16B0.62641.09490.89820.096*
H16C0.65521.14120.81060.096*
H20.222 (3)0.6833 (15)0.7316 (14)0.067 (7)*
H30.450 (4)0.6731 (19)0.8373 (15)0.082 (8)*
H40.398 (3)0.7704 (18)0.9581 (14)0.077 (7)*
H50.128 (3)0.8792 (16)0.9739 (14)0.067 (7)*
H100.788 (3)1.0332 (13)0.7063 (11)0.043 (5)*
N10.0967 (2)0.80764 (12)0.73050 (9)0.0461 (4)
O10.5212 (2)1.00604 (12)0.81193 (8)0.0604 (4)
O20.84061 (18)0.97636 (10)0.55154 (8)0.0537 (3)
O30.5617 (2)0.86625 (11)0.49516 (8)0.0574 (4)
S10.18854 (8)0.91984 (4)0.85636 (3)0.05518 (15)
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
C10.0448 (10)0.0467 (9)0.0429 (10)0.0012 (8)0.0007 (8)0.0006 (8)
C20.0579 (12)0.0641 (12)0.0556 (12)0.0135 (11)0.0050 (11)0.0069 (10)
C30.0525 (12)0.0691 (13)0.0755 (15)0.0110 (11)0.0099 (11)0.0008 (12)
C40.0585 (13)0.0661 (13)0.0669 (14)0.0005 (11)0.0216 (12)0.0010 (11)
C50.0655 (13)0.0604 (12)0.0510 (11)0.0045 (11)0.0141 (10)0.0073 (10)
C60.0493 (10)0.0450 (9)0.0445 (10)0.0021 (8)0.0055 (8)0.0031 (8)
C70.0478 (10)0.0398 (8)0.0353 (9)0.0033 (8)0.0023 (7)0.0032 (7)
C80.0438 (9)0.0393 (8)0.0366 (9)0.0019 (7)0.0001 (7)0.0001 (7)
C90.0497 (10)0.0433 (9)0.0366 (9)0.0008 (8)0.0044 (8)0.0010 (7)
C100.0459 (10)0.0431 (9)0.0466 (10)0.0052 (9)0.0057 (9)0.0004 (8)
C110.0422 (9)0.0396 (8)0.0451 (9)0.0021 (8)0.0023 (8)0.0061 (7)
C120.0505 (10)0.0434 (10)0.0369 (9)0.0003 (8)0.0026 (8)0.0006 (7)
C130.0468 (10)0.0397 (9)0.0406 (9)0.0023 (7)0.0013 (8)0.0024 (7)
C140.0804 (15)0.0773 (14)0.0432 (11)0.0204 (12)0.0057 (11)0.0146 (11)
C150.0460 (11)0.0729 (13)0.0679 (13)0.0114 (10)0.0046 (10)0.0100 (11)
C160.0781 (14)0.0650 (12)0.0492 (11)0.0179 (12)0.0098 (11)0.0125 (10)
N10.0498 (9)0.0514 (8)0.0371 (8)0.0064 (7)0.0025 (7)0.0051 (7)
O10.0670 (9)0.0732 (9)0.0412 (7)0.0227 (8)0.0023 (6)0.0153 (7)
O20.0494 (7)0.0600 (8)0.0518 (7)0.0081 (6)0.0091 (6)0.0007 (6)
O30.0603 (8)0.0719 (9)0.0400 (7)0.0122 (7)0.0081 (7)0.0087 (7)
S10.0594 (3)0.0634 (3)0.0428 (2)0.0111 (3)0.0081 (2)0.0165 (2)
Geometric parameters (Å, º) top
C1—N11.388 (2)C10—C111.381 (3)
C1—C21.389 (3)C10—H100.909 (19)
C1—C61.396 (3)C11—O21.359 (2)
C2—C31.376 (3)C11—C121.407 (3)
C2—H20.96 (2)C12—O31.366 (2)
C3—C41.382 (3)C12—C131.368 (2)
C3—H31.00 (3)C13—H130.9300
C4—C51.374 (3)C14—O31.407 (2)
C4—H40.97 (2)C14—H14A0.9600
C5—C61.396 (3)C14—H14B0.9600
C5—H50.97 (2)C14—H14C0.9600
C6—S11.7283 (19)C15—O21.424 (2)
C7—N11.301 (2)C15—H15A0.9600
C7—C81.468 (2)C15—H15C0.9600
C7—S11.7583 (17)C15—H15B0.9600
C8—C91.389 (2)C16—O11.411 (2)
C8—C131.408 (2)C16—H16A0.9600
C9—O11.358 (2)C16—H16B0.9600
C9—C101.397 (3)C16—H16C0.9600
N1—C1—C2125.93 (18)O2—C11—C12115.28 (15)
N1—C1—C6114.58 (16)C10—C11—C12120.20 (17)
C2—C1—C6119.49 (18)O3—C12—C13125.58 (17)
C3—C2—C1119.0 (2)O3—C12—C11115.25 (16)
C3—C2—H2119.0 (14)C13—C12—C11119.17 (17)
C1—C2—H2122.0 (14)C12—C13—C8121.80 (17)
C2—C3—C4121.1 (2)C12—C13—H13119.1
C2—C3—H3121.0 (15)C8—C13—H13119.1
C4—C3—H3117.9 (14)O3—C14—H14A109.5
C5—C4—C3121.3 (2)O3—C14—H14B109.5
C5—C4—H4116.7 (14)H14A—C14—H14B109.5
C3—C4—H4122.0 (14)O3—C14—H14C109.5
C4—C5—C6117.8 (2)H14A—C14—H14C109.5
C4—C5—H5123.6 (13)H14B—C14—H14C109.5
C6—C5—H5118.6 (13)O2—C15—H15A109.5
C1—C6—C5121.38 (18)O2—C15—H15C109.5
C1—C6—S1110.02 (14)H15A—C15—H15C109.5
C5—C6—S1128.60 (16)O2—C15—H15B109.5
N1—C7—C8122.20 (15)H15A—C15—H15B109.5
N1—C7—S1114.88 (14)H15C—C15—H15B109.5
C8—C7—S1122.92 (13)O1—C16—H16A109.5
C9—C8—C13118.13 (15)O1—C16—H16B109.5
C9—C8—C7123.81 (15)H16A—C16—H16B109.5
C13—C8—C7118.05 (15)O1—C16—H16C109.5
O1—C9—C8116.58 (16)H16A—C16—H16C109.5
O1—C9—C10122.66 (16)H16B—C16—H16C109.5
C8—C9—C10120.76 (16)C7—N1—C1111.47 (15)
C11—C10—C9119.88 (17)C9—O1—C16120.09 (15)
C11—C10—H10122.8 (11)C11—O2—C15117.73 (15)
C9—C10—H10117.2 (11)C12—O3—C14117.27 (15)
O2—C11—C10124.53 (17)C6—S1—C789.04 (9)
N1—C1—C2—C3179.2 (2)O2—C11—C12—O32.5 (2)
C6—C1—C2—C30.3 (3)C10—C11—C12—O3177.22 (16)
C1—C2—C3—C40.2 (4)O2—C11—C12—C13177.91 (15)
C2—C3—C4—C50.3 (4)C10—C11—C12—C132.4 (3)
C3—C4—C5—C60.6 (3)O3—C12—C13—C8177.75 (17)
N1—C1—C6—C5179.53 (18)C11—C12—C13—C81.8 (3)
C2—C1—C6—C50.0 (3)C9—C8—C13—C120.4 (3)
N1—C1—C6—S10.5 (2)C7—C8—C13—C12179.76 (16)
C2—C1—C6—S1179.92 (15)C8—C7—N1—C1179.19 (15)
C4—C5—C6—C10.5 (3)S1—C7—N1—C10.6 (2)
C4—C5—C6—S1179.64 (17)C2—C1—N1—C7179.49 (18)
N1—C7—C8—C9175.75 (17)C6—C1—N1—C70.0 (2)
S1—C7—C8—C94.5 (2)C8—C9—O1—C16175.31 (17)
N1—C7—C8—C134.4 (2)C10—C9—O1—C164.5 (3)
S1—C7—C8—C13175.33 (13)C10—C11—O2—C151.9 (3)
C13—C8—C9—O1177.79 (16)C12—C11—O2—C15177.74 (15)
C7—C8—C9—O12.1 (3)C13—C12—O3—C140.1 (3)
C13—C8—C9—C102.0 (3)C11—C12—O3—C14179.71 (17)
C7—C8—C9—C10178.11 (16)C1—C6—S1—C70.69 (14)
O1—C9—C10—C11178.34 (16)C5—C6—S1—C7179.4 (2)
C8—C9—C10—C111.5 (3)N1—C7—S1—C60.75 (15)
C9—C10—C11—O2179.56 (16)C8—C7—S1—C6179.01 (15)
C9—C10—C11—C120.8 (3)

Experimental details

Crystal data
Chemical formulaC16H15NO3S
Mr301.35
Crystal system, space groupOrthorhombic, P212121
Temperature (K)273
a, b, c (Å)6.9897 (6), 12.6809 (11), 16.4228 (14)
V3)1455.6 (2)
Z4
Radiation typeMo Kα
µ (mm1)0.23
Crystal size (mm)0.18 × 0.12 × 0.08
Data collection
DiffractometerSiemens SMART CCD area-detector
Absorption correctionMulti-scan
(SADABS; Sheldrick, 1996)
Tmin, Tmax0.960, 0.982
No. of measured, independent and
observed [I > 2σ(I)] reflections
9473, 3309, 2843
Rint0.022
(sin θ/λ)max1)0.650
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.034, 0.089, 1.03
No. of reflections3309
No. of parameters213
H-atom treatmentH atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å3)0.20, 0.18
Absolute structureFlack (1983)
Absolute structure parameter0.06 (7)

Computer programs: SMART (Siemens, 1996), SAINT (Siemens, 1996), SAINT, SHELXS97 (Sheldrick, 1997a), SHELXL97 (Sheldrick, 1997a), SHELXTL (Sheldrick, 1997b), SHELXTL.

Selected geometric parameters (Å, º) top
C1—N11.388 (2)C11—O21.359 (2)
C6—S11.7283 (19)C12—O31.366 (2)
C7—N11.301 (2)C14—O31.407 (2)
C7—S11.7583 (17)C15—O21.424 (2)
C9—O11.358 (2)C16—O11.411 (2)
C7—N1—C1111.47 (15)C12—O3—C14117.27 (15)
C9—O1—C16120.09 (15)C6—S1—C789.04 (9)
C11—O2—C15117.73 (15)
C8—C9—O1—C16175.31 (17)C12—C11—O2—C15177.74 (15)
C10—C9—O1—C164.5 (3)C13—C12—O3—C140.1 (3)
C10—C11—O2—C151.9 (3)C11—C12—O3—C14179.71 (17)
 

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