Methyl 3-O-α-d-mannopyranosyl β-d-glucopyran­oside tetra­hydrate

Eriksson, L.; Widmalm, G.

doi:10.1107/S1600536808021454

organic compounds

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ISSN: 2056-9890

Volume 64| Part 8| August 2008| Pages o1639-o1640

doi:10.1107/S1600536808021454

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Methyl 3-O-α-D-mannopyranosyl β-D-glucopyranoside tetrahydrate

Lars Eriksson ^a ^* and Göran Widmalm ^b

^aDivision of Structural Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden, and ^bDepartment of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
^*Correspondence e-mail: lerik@struc.su.se

(Received 7 July 2008; accepted 10 July 2008; online 31 July 2008)

The title compound, C₁₃H₂₄O₁₁·4H₂O, forms extended hydrogen-bonded networks. These are present between disaccharides, but not as inter-residue hydrogen bonds, as well as to water molecules that in addition form an intermolecular chain of hydrogen bonds. The conformation of the disaccharide is described by the glycosidic torsion angles φ_H = −34° and ψ_H = −5°. Macroscopically, the disaccharide was observed to be hygroscopic.

Related literature

For related literature, see: Cremer & Pople (1975 ); Eriksson & Widmalm (2005 ); Eriksson et al. (1997 , 2000 , 2002 ); Färnbäck et al. (2003 , 2008 ); Hassel & Ottar (1947 ); Huskens (2006 ); Jansson et al. (1990 ); Juaristi & Cuevas (1992 ); Odelius et al. (1995 ); Vishnyakov et al. (2000 ).

Experimental

Crystal data

C₁₃H₂₄O₁₁·4H₂O
M_r = 428.39
Monoclinic, C 2
a = 18.275 (3) Å
b = 7.7293 (12) Å
c = 13.910 (3) Å
β = 97.87 (2)°
V = 1946.4 (6) Å³
Z = 4
Mo Kα radiation
μ = 0.14 mm⁻¹
T = 291 (2) K
0.40 × 0.30 × 0.15 mm

Data collection

Stoe IPDS diffractometer
Absorption correction: numerical (X-RED; Stoe & Cie, 1997 ) T_min = 0.95, T_max = 0.98
8973 measured reflections
2017 independent reflections
1706 reflections with I > 2σ(I)
R_int = 0.037

Refinement

R[F² > 2σ(F²)] = 0.025
wR(F²) = 0.059
S = 0.99
2017 reflections
287 parameters
9 restraints
H atoms treated by a mixture of independent and constrained refinement
Δρ_max = 0.13 e Å⁻³
Δρ_min = −0.14 e Å⁻³

Table 1
Selected torsion angles (°)

O5m—C5m—C6m—O6m	−64.9 (2)
C4m—C5m—C6m—O6m	57.2 (2)
O5g—C1g—O1g—C7	−71.2 (2)
C2g—C1g—O1g—C7	168.7 (2)
O5m—C1m—O3g—C3g	85.18 (19)
C2m—C1m—O3g—C3g	−151.40 (15)
C4g—C3g—O3g—C1m	112.63 (18)
C2g—C3g—O3g—C1m	−124.11 (18)
O5g—C5g—C6g—O6g	−69.7 (2)
C4g—C5g—C6g—O6g	50.1 (2)
H1m—C1m—O3g—C3g	−34
C1m—O3g—C3g—H3g	−5

Table 2
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2m—H2m1⋯O3mⁱ	0.82	1.96	2.732 (2)	156
O3m—H3m1⋯O6mⁱⁱ	0.82	1.89	2.705 (2)	172
O4m—H4m1⋯OW4ⁱⁱⁱ	0.82	2.03	2.803 (2)	158
O6m—H6m⋯OW3^iv	0.82	2.00	2.796 (2)	166
O2g—H2g1⋯O4m^v	0.82	2.25	2.848 (2)	130
O2g—H2g1⋯O3m^v	0.82	2.43	3.140 (2)	145
O4g—H4g1⋯OW2^vi	0.82	1.91	2.733 (2)	177
O6g—H6g⋯OW1^vi	0.82	2.00	2.794 (2)	162
OW1—H11⋯O4g	0.94 (2)	1.80 (2)	2.736 (2)	174 (4)
OW1—H12⋯OW2	0.97 (2)	1.92 (3)	2.834 (2)	156 (2)
OW2—H21⋯OW3	0.92 (2)	1.98 (2)	2.866 (2)	161 (4)
OW2—H22⋯O2g^vi	0.90 (3)	2.06 (3)	2.915 (2)	159 (4)
OW3—H31⋯O1g^vii	0.91 (3)	1.94 (3)	2.814 (2)	163 (4)
OW3—H32⋯OW4	0.90 (2)	1.92 (2)	2.807 (2)	167 (4)
OW4—H41⋯O6g^vii	0.89 (2)	2.04 (2)	2.916 (2)	168 (3)
OW4—H42⋯O2m^vi	0.89 (2)	1.88 (3)	2.747 (2)	163 (4)
Symmetry codes: (i) -x, y, -z; (ii) x, y-1, z; (iii) $[x-{\script{1\over 2}}, y+{\script{1\over 2}}, z-1]$ ; (iv) $[-x+{\script{1\over 2}}, y+{\script{1\over 2}}, -z+1]$ ; (v) $[-x+{\script{1\over 2}}, y+{\script{1\over 2}}, -z]$ ; (vi) $[-x+{\script{1\over 2}}, y-{\script{1\over 2}}, -z+1]$ ; (vii) -x+1, y, -z+1.

Data collection: EXPOSE (Stoe & Cie, 1997); cell refinement: CELL (Stoe & Cie, 1997); data reduction: INTEGRATE (Stoe & Cie, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Bergerhoff, 1996 ); software used to prepare material for publication: PLATON (Spek, 2003 ).

Supporting information

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536808021454/om2251sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536808021454/om2251Isup2.hkl

checkCIF report

Comment top

Carbohydrates in biological systems, in the case of N-linked glycans of glycoproteins the result of post-translational modifications, are of functional significance due to e.g. their influence on protein stability. Furthermore, highly specific epitopes are formed by oligosaccharides present as glycoconjugates. The information contents in carbohydrate structures are indeed very large as a consequence of the immense numbers of permutations possible by combining different linkages and anomeric configurations of the sugar residues. It is of particular importance that the often weak carbohydrate interactions function by resorting to multivalent interactions upon cell-cell recognition (Huskens, 2006).

The major degrees of freedom in an oligosaccharide are described by the torsion angles ϕ_H, ψ_H, and ω. For the title compound the two former are present at the glycosidic α-(1 → 3)-linkage with ϕ_H being defined by H1m—C1m—O3g—C3g and ψ_H by C1m—O3g—C3g—H3g. The ω torsion angle, defined by O5—C5—C6—O6, refers to the conformation of the hydroxymethyl group of each sugar residue. The structure is described as the exo-anomeric conformation with ϕ_H = -34°, which, as a result of stereoelectronic effects, is characteristic of sugars in a cyclic form (Fig. 1). For the title compound the presence of the endo-anomeric effect (Juaristi & Cuevas, 1992) is evident from the difference in C—O bond lengths at the anomeric positions of the α-D-Manp residue having the axial bond C1m—O3g = 1.409 (2) Å and the β-D-Glcp residue having the equatorial bond C1g—O1g = 1.402 (2) Å, i.e., the bond with the axial electronegative atom is longer than the corresponding equatorial one, in complete agreement with ab initio data of model compounds (Odelius et al., 1995). At the glycosidic linkage ψ_H = -5°, leading to an almost eclipsed conformation and as a result the inter-residue distance across the glycosidic linkage for the proton pair H1m—H3g becomes short, only 2.12 Å.

The conformations of the hydroxymethyl groups are described by one of the three rotamers, gauche-trans, gauche-gauche, or trans-gauche with respect to the orientation of C6—O6 to C5—O5 and to C5—C4, respectively. In the present case both the mannopyranosyl and the glucopyranosyl residues show the gg conformation for their hydroxymethyl groups with ω = -64.9 (2)° and ω = -69.7 (2)°, respectively. This conformation is one of the two anticipated rotamers for the monosaccharides in the title compound, since both have an equatorial hydroxyl group at C4, which precludes the tg rotamer as a result of a non-favorable 1,3-diaxial interaction known as the Hassel-Ottar effect (Hassel & Ottar, 1947).

The calculated Cremer & Pople (1975) parameters show that both the mannose and glucose rings are close to the expected chair conformation, i.e. ⁴C₁. The parameters for the mannose ring are [Q=0.555 (2) Å, θ=3.0 (2) ° and ϕ=302 (3) °] and for the glucose ring [Q=0.575 (2) Å, θ=10.0 (2) ° and ϕ=327 (1) °].

The title compound was quite hygroscopic. This fact is consistent with the relatively high water content in the crystal of the title disaccharide. In our previous structural studies on disaccharide crystals the number of water molecules ranged from zero to three per disaccharide (Eriksson et al. 1997, 2000, 2002, 2005; Färnbäck et al. 2003, 2008). All hydroxyl groups and all H atoms of the four water molecules are hydrogen bond donors and the structure is stabilized by an elaborate hydrogen bond network. The four water molecules can be considered as lying in channels along the b-direction between the sugar residues as shown in Fig. 2. Previous conformational studies on the title compound that focused on solution patterns in binary aqueous solvent mixtures indicated that an inter-residue hydrogen bond was present between O6m as the donor atom and O2g as the acceptor atom (Vishnyakov et al. 2000). This was possible when the ω torsion angle of the mannosyl residue had the gt conformation. However, in the present crystal structure the exo-cyclic hydroxymethyl groups of the glucosyl residue as well as that in the mannosyl residue have the gg conformation, the latter of which precludes the intra-molecular hydrogen bond. Further analysis of the hydrogen bonding patterns showed that O6m acts as a donor to OW3. The O6g atom, on the other hand, acts as a donor to OW1, which acts as a donor to OW2, continued in a donor-acceptor relationship to OW3, and in an analogous way to OW4. Finally, the latter water molecule acts as a donor to the acceptor O6g in another molecule. Thus, the water-mediated chain starts from one glucosyl residue and ends at a symmetry related glucosyl residue. Along the 'chain of water molecules' various atoms of the sugar residues act as hydrogen bond donors and acceptors. The close proximity of O2g in one molecule and O3m and O4m in a symmetry related molecule at distances of 3.140 (2) Å and 2.848 (2) Å, respectively, indicate that a bifurcated hydrogen bond is present with O2g as the donor atom. The triangle formed by the three oxygen atoms is almost isosceles with an O3m^v—O2g—O4m^v [symmetry code (v): -x + 1/2,y + 1/2,-z] angle of 56.09 (4)°.

Related literature top

For related literature, see: Cremer & Pople (1975); Eriksson & Widmalm (2005); Eriksson et al. (1997, 2000, 2002); Färnbäck et al. (2003, 2008); Hassel & Ottar (1947); Huskens (2006); Jansson et al. (1990); Juaristi & Cuevas (1992); Odelius et al. (1995); Vishnyakov et al. (2000).

Experimental top

The synthesis of the title compound was described by Jansson et al. (1990). The disaccharide was crystallized by slow evaporation from a mixture of water, ethanol and acetonitrile (1:1:1) at ambient temperature. The absolute configuration of each sugar residue is known from the starting compounds used in the synthesis.

Computing details top

Data collection: EXPOSE (Stoe & Cie, 1997); cell refinement: CELL (Stoe & Cie, 1997); data reduction: INTEGRATE (Stoe & Cie, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Bergerhoff, 1996); software used to prepare material for publication: PLATON (Spek, 2003).

Figures top

	Fig. 1. Molecular structure of the title compound, showing 50% probability displacement ellipsoids and the atom numbering scheme. H atoms are shown as small spheres of arbitrary radii.
	Fig. 2. Crystal packing of the title compound, showing slightly more than one unit cell, viewed along the b axis direction. The water molecules between the sugar residues are situated in channels along the b-direction.

Methyl 3-O-α-D-mannopyranosyl β-D-glucopyranoside tetrahydrate top

Crystal data top

C₁₃H₂₄O₁₁·4H₂O	F(000) = 920
M_r = 428.39	D_x = 1.462 Mg m⁻³
Monoclinic, C2	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: C 2y	Cell parameters from 1641 reflections
a = 18.275 (3) Å	θ = 2.3–25.9°
b = 7.7293 (12) Å	µ = 0.14 mm⁻¹
c = 13.910 (3) Å	T = 291 K
β = 97.87 (2)°	Block, colourless
V = 1946.4 (6) Å³	0.40 × 0.30 × 0.15 mm
Z = 4

Data collection top

Stoe IPDS diffractometer	2017 independent reflections
Radiation source: fine-focus sealed tube	1706 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.037
Detector resolution: 6 pixels mm^-1	θ_max = 25.9°, θ_min = 2.3°
ϕ scans	h = −22→22
Absorption correction: numerical (X-RED; Stoe & Cie, 1997)	k = −9→9
T_min = 0.95, T_max = 0.98	l = −16→17
8973 measured reflections

Refinement top

Refinement on F²	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: difference Fourier map
R[F² > 2σ(F²)] = 0.025	H atoms treated by a mixture of independent and constrained refinement
wR(F²) = 0.059	w = 1/[σ²(F_o²) + (0.0391P)²] where P = (F_o² + 2F_c²)/3
S = 0.99	(Δ/σ)_max < 0.001
2017 reflections	Δρ_max = 0.13 e Å⁻³
287 parameters	Δρ_min = −0.14 e Å⁻³
9 restraints	Extinction correction: SHELXL97 (Sheldrick, 2008), Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0.0054 (9)

Crystal data top

C₁₃H₂₄O₁₁·4H₂O	V = 1946.4 (6) Å³
M_r = 428.39	Z = 4
Monoclinic, C2	Mo Kα radiation
a = 18.275 (3) Å	µ = 0.14 mm⁻¹
b = 7.7293 (12) Å	T = 291 K
c = 13.910 (3) Å	0.40 × 0.30 × 0.15 mm
β = 97.87 (2)°

Data collection top

Stoe IPDS diffractometer	2017 independent reflections
Absorption correction: numerical (X-RED; Stoe & Cie, 1997)	1706 reflections with I > 2σ(I)
T_min = 0.95, T_max = 0.98	R_int = 0.037
8973 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.025	9 restraints
wR(F²) = 0.059	H atoms treated by a mixture of independent and constrained refinement
S = 0.99	Δρ_max = 0.13 e Å⁻³
2017 reflections	Δρ_min = −0.14 e Å⁻³
287 parameters

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

	x	y	z	U_iso*/U_eq
C1m	0.16629 (10)	0.4371 (3)	0.18727 (14)	0.0237 (4)
H1m	0.1530	0.4374	0.2531	0.028*
C2m	0.11852 (10)	0.3031 (3)	0.12731 (15)	0.0253 (4)
H2m	0.1312	0.1869	0.1525	0.030*
O2m	0.04476 (7)	0.3436 (2)	0.14055 (11)	0.0354 (4)
H2m1	0.0161	0.2829	0.1047	0.053*
C3m	0.13077 (10)	0.3138 (3)	0.02186 (15)	0.0231 (4)
H3m	0.1812	0.2752	0.0169	0.028*
O3m	0.08036 (8)	0.2061 (2)	−0.03918 (11)	0.0297 (3)
H3m1	0.0874	0.1046	−0.0234	0.044*
C4m	0.12196 (11)	0.4985 (3)	−0.01623 (14)	0.0246 (4)
H4m	0.0703	0.5351	−0.0193	0.030*
O4m	0.14398 (9)	0.5051 (2)	−0.11052 (11)	0.0390 (4)
H4m1	0.1121	0.5547	−0.1478	0.059*
C5m	0.17184 (10)	0.6189 (3)	0.05093 (14)	0.0251 (4)
H5m	0.2233	0.5838	0.0501	0.030*
O5m	0.15526 (7)	0.60426 (18)	0.14856 (9)	0.0244 (3)
C6m	0.16458 (11)	0.8075 (3)	0.02356 (17)	0.0312 (5)
H6m1	0.1970	0.8747	0.0705	0.037*
H6m2	0.1809	0.8234	−0.0394	0.037*
O6m	0.09124 (8)	0.8723 (2)	0.01954 (13)	0.0393 (4)
H6m	0.0769	0.8585	0.0724	0.059*
C1g	0.41344 (10)	0.5571 (3)	0.33556 (15)	0.0276 (5)
H1g	0.3968	0.6384	0.3821	0.033*
O1g	0.47702 (7)	0.6210 (2)	0.30165 (10)	0.0340 (4)
C2g	0.35400 (10)	0.5359 (3)	0.24839 (15)	0.0288 (5)
H2g	0.3743	0.4734	0.1967	0.035*
O2g	0.32707 (8)	0.6996 (2)	0.21340 (13)	0.0441 (4)
H2g1	0.3564	0.7431	0.1808	0.066*
C3g	0.28842 (10)	0.4364 (3)	0.27749 (14)	0.0244 (4)
H3g	0.2609	0.5128	0.3159	0.029*
O3g	0.24034 (6)	0.38309 (19)	0.19220 (10)	0.0268 (3)
C4g	0.31150 (10)	0.2760 (3)	0.33673 (14)	0.0251 (4)
H4g	0.3316	0.1905	0.2954	0.030*
O4g	0.24809 (7)	0.2055 (2)	0.37211 (11)	0.0330 (4)
H4g1	0.2383	0.1108	0.3470	0.050*
C5g	0.37025 (10)	0.3225 (3)	0.42143 (15)	0.0278 (4)
H5g	0.3501	0.4101	0.4615	0.033*
O5g	0.43192 (7)	0.3957 (2)	0.38142 (11)	0.0310 (3)
C6g	0.39763 (12)	0.1712 (3)	0.48482 (17)	0.0400 (6)
H6g1	0.4398	0.2075	0.5304	0.048*
H6g2	0.3590	0.1348	0.5218	0.048*
O6g	0.41839 (9)	0.0293 (2)	0.42994 (15)	0.0498 (5)
H6g	0.3866	−0.0460	0.4273	0.075*
C7	0.53302 (12)	0.6785 (4)	0.37756 (18)	0.0435 (6)
H71	0.5146	0.7745	0.4109	0.065*
H72	0.5760	0.7139	0.3499	0.065*
H73	0.5459	0.5857	0.4225	0.065*
OW1	0.19300 (11)	0.2972 (3)	0.53816 (17)	0.0612 (5)
H11	0.2119 (18)	0.274 (5)	0.480 (2)	0.092*
H12	0.2364 (15)	0.320 (5)	0.585 (2)	0.092*
OW2	0.28912 (11)	0.3894 (3)	0.70793 (15)	0.0564 (5)
H21	0.3355 (13)	0.361 (5)	0.737 (3)	0.085*
H22	0.2615 (18)	0.332 (5)	0.747 (3)	0.085*
OW3	0.44168 (10)	0.3766 (3)	0.78999 (16)	0.0577 (5)
H31	0.4706 (19)	0.463 (4)	0.773 (3)	0.086*
H32	0.4659 (19)	0.275 (4)	0.787 (3)	0.086*
OW4	0.52138 (11)	0.0800 (3)	0.75157 (14)	0.0540 (5)
H41	0.5331 (19)	0.061 (5)	0.6924 (19)	0.081*
H42	0.4990 (18)	−0.009 (4)	0.776 (3)	0.081*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1m	0.0207 (8)	0.0279 (11)	0.0223 (10)	0.0007 (8)	0.0020 (7)	0.0011 (8)
C2m	0.0215 (9)	0.0253 (11)	0.0285 (11)	−0.0011 (8)	0.0014 (8)	0.0026 (9)
O2m	0.0218 (6)	0.0514 (10)	0.0336 (8)	−0.0102 (7)	0.0067 (6)	−0.0122 (7)
C3m	0.0188 (8)	0.0236 (10)	0.0264 (10)	0.0030 (8)	0.0015 (7)	−0.0035 (9)
O3m	0.0329 (7)	0.0208 (7)	0.0322 (8)	0.0033 (6)	−0.0064 (6)	−0.0024 (6)
C4m	0.0258 (9)	0.0262 (11)	0.0218 (10)	0.0034 (8)	0.0026 (8)	0.0008 (9)
O4m	0.0518 (9)	0.0410 (10)	0.0261 (8)	0.0069 (8)	0.0118 (7)	0.0037 (7)
C5m	0.0227 (9)	0.0258 (10)	0.0273 (10)	0.0015 (8)	0.0049 (8)	0.0029 (9)
O5m	0.0255 (7)	0.0238 (7)	0.0236 (7)	0.0009 (6)	0.0023 (5)	−0.0015 (6)
C6m	0.0305 (10)	0.0253 (11)	0.0377 (12)	−0.0014 (9)	0.0045 (9)	0.0040 (10)
O6m	0.0382 (8)	0.0271 (8)	0.0528 (10)	0.0086 (7)	0.0070 (7)	0.0084 (8)
C1g	0.0230 (9)	0.0328 (12)	0.0277 (10)	−0.0026 (8)	0.0059 (8)	0.0006 (9)
O1g	0.0244 (7)	0.0456 (9)	0.0323 (8)	−0.0101 (7)	0.0056 (6)	−0.0001 (7)
C2g	0.0243 (9)	0.0347 (12)	0.0276 (11)	−0.0026 (9)	0.0046 (8)	0.0048 (9)
O2g	0.0347 (8)	0.0448 (10)	0.0522 (11)	−0.0040 (8)	0.0033 (7)	0.0247 (9)
C3g	0.0220 (9)	0.0288 (11)	0.0214 (10)	−0.0010 (8)	−0.0002 (7)	−0.0002 (9)
O3g	0.0202 (6)	0.0349 (8)	0.0238 (7)	0.0044 (6)	−0.0027 (5)	−0.0025 (7)
C4g	0.0218 (9)	0.0272 (11)	0.0263 (10)	−0.0003 (8)	0.0029 (7)	0.0021 (9)
O4g	0.0304 (7)	0.0347 (9)	0.0351 (9)	−0.0087 (7)	0.0082 (6)	−0.0006 (8)
C5g	0.0239 (9)	0.0328 (11)	0.0263 (10)	−0.0007 (8)	0.0023 (8)	0.0020 (9)
O5g	0.0213 (6)	0.0361 (8)	0.0348 (8)	−0.0011 (6)	0.0006 (6)	0.0062 (7)
C6g	0.0327 (11)	0.0499 (16)	0.0357 (13)	0.0002 (10)	−0.0017 (9)	0.0120 (11)
O6g	0.0454 (9)	0.0424 (10)	0.0628 (12)	0.0112 (8)	0.0112 (9)	0.0138 (9)
C7	0.0316 (11)	0.0531 (16)	0.0444 (14)	−0.0129 (11)	0.0001 (9)	−0.0019 (12)
OW1	0.0568 (11)	0.0722 (14)	0.0581 (13)	−0.0008 (10)	0.0205 (9)	−0.0107 (12)
OW2	0.0614 (11)	0.0459 (11)	0.0601 (12)	0.0062 (10)	0.0014 (9)	0.0157 (11)
OW3	0.0507 (10)	0.0498 (12)	0.0775 (14)	−0.0013 (9)	0.0270 (10)	0.0152 (11)
OW4	0.0581 (11)	0.0581 (13)	0.0474 (11)	−0.0042 (9)	0.0128 (9)	0.0088 (10)

Geometric parameters (Å, º) top

C1m—O5m	1.403 (2)	C2g—C3g	1.525 (3)
C1m—O3g	1.409 (2)	C2g—H2g	0.9800
C1m—C2m	1.527 (3)	O2g—H2g1	0.8200
C1m—H1m	0.9800	C3g—O3g	1.437 (2)
C2m—O2m	1.420 (2)	C3g—C4g	1.516 (3)
C2m—C3m	1.516 (3)	C3g—H3g	0.9800
C2m—H2m	0.9800	C4g—O4g	1.428 (2)
O2m—H2m1	0.8200	C4g—C5g	1.524 (3)
C3m—O3m	1.431 (2)	C4g—H4g	0.9800
C3m—C4m	1.523 (3)	O4g—H4g1	0.8200
C3m—H3m	0.9800	C5g—O5g	1.439 (2)
O3m—H3m1	0.8200	C5g—C6g	1.508 (3)
C4m—O4m	1.425 (2)	C5g—H5g	0.9800
C4m—C5m	1.529 (3)	C6g—O6g	1.417 (3)
C4m—H4m	0.9800	C6g—H6g1	0.9700
O4m—H4m1	0.8200	C6g—H6g2	0.9700
C5m—O5m	1.436 (2)	O6g—H6g	0.8200
C5m—C6m	1.508 (3)	C7—H71	0.9600
C5m—H5m	0.9800	C7—H72	0.9600
C6m—O6m	1.425 (3)	C7—H73	0.9600
C6m—H6m1	0.9700	OW1—H11	0.94 (2)
C6m—H6m2	0.9700	OW1—H12	0.97 (2)
O6m—H6m	0.8200	OW2—H21	0.92 (2)
C1g—O1g	1.402 (2)	OW2—H22	0.90 (2)
C1g—O5g	1.421 (3)	OW3—H31	0.91 (2)
C1g—C2g	1.522 (3)	OW3—H32	0.90 (2)
C1g—H1g	0.9800	OW4—H41	0.89 (2)
O1g—C7	1.437 (3)	OW4—H42	0.89 (2)
C2g—O2g	1.419 (3)	H1m—H3g	2.12

O5m—C1m—O3g	112.22 (16)	C1g—O1g—C7	113.67 (16)
O5m—C1m—C2m	111.93 (15)	O2g—C2g—C1g	110.69 (18)
O3g—C1m—C2m	107.40 (16)	O2g—C2g—C3g	107.01 (16)
O5m—C1m—H1m	108.4	C1g—C2g—C3g	110.13 (17)
O3g—C1m—H1m	108.4	O2g—C2g—H2g	109.7
C2m—C1m—H1m	108.4	C1g—C2g—H2g	109.7
O2m—C2m—C3m	112.45 (16)	C3g—C2g—H2g	109.7
O2m—C2m—C1m	105.16 (16)	C2g—O2g—H2g1	109.5
C3m—C2m—C1m	110.02 (15)	O3g—C3g—C4g	107.92 (16)
O2m—C2m—H2m	109.7	O3g—C3g—C2g	109.85 (16)
C3m—C2m—H2m	109.7	C4g—C3g—C2g	112.73 (16)
C1m—C2m—H2m	109.7	O3g—C3g—H3g	108.8
C2m—O2m—H2m1	109.5	C4g—C3g—H3g	108.8
O3m—C3m—C2m	111.96 (16)	C2g—C3g—H3g	108.8
O3m—C3m—C4m	108.06 (15)	C1m—O3g—C3g	115.46 (15)
C2m—C3m—C4m	111.41 (16)	O4g—C4g—C3g	108.71 (15)
O3m—C3m—H3m	108.4	O4g—C4g—C5g	110.03 (16)
C2m—C3m—H3m	108.4	C3g—C4g—C5g	109.96 (16)
C4m—C3m—H3m	108.4	O4g—C4g—H4g	109.4
C3m—O3m—H3m1	109.5	C3g—C4g—H4g	109.4
O4m—C4m—C3m	108.92 (16)	C5g—C4g—H4g	109.4
O4m—C4m—C5m	108.71 (16)	C4g—O4g—H4g1	109.5
C3m—C4m—C5m	109.40 (15)	O5g—C5g—C6g	108.43 (16)
O4m—C4m—H4m	109.9	O5g—C5g—C4g	107.44 (16)
C3m—C4m—H4m	109.9	C6g—C5g—C4g	114.28 (18)
C5m—C4m—H4m	109.9	O5g—C5g—H5g	108.9
C4m—O4m—H4m1	109.5	C6g—C5g—H5g	108.9
O5m—C5m—C6m	107.01 (16)	C4g—C5g—H5g	108.9
O5m—C5m—C4m	110.16 (15)	C1g—O5g—C5g	111.60 (14)
C6m—C5m—C4m	114.19 (17)	O6g—C6g—C5g	112.14 (19)
O5m—C5m—H5m	108.4	O6g—C6g—H6g1	109.2
C6m—C5m—H5m	108.4	C5g—C6g—H6g1	109.2
C4m—C5m—H5m	108.4	O6g—C6g—H6g2	109.2
C1m—O5m—C5m	113.43 (15)	C5g—C6g—H6g2	109.2
O6m—C6m—C5m	113.55 (17)	H6g1—C6g—H6g2	107.9
O6m—C6m—H6m1	108.9	C6g—O6g—H6g	109.5
C5m—C6m—H6m1	108.9	O1g—C7—H71	109.5
O6m—C6m—H6m2	108.9	O1g—C7—H72	109.5
C5m—C6m—H6m2	108.9	H71—C7—H72	109.5
H6m1—C6m—H6m2	107.7	O1g—C7—H73	109.5
C6m—O6m—H6m	109.5	H71—C7—H73	109.5
O1g—C1g—O5g	107.66 (15)	H72—C7—H73	109.5
O1g—C1g—C2g	107.69 (16)	H11—OW1—H12	105 (3)
O5g—C1g—C2g	111.29 (17)	H21—OW2—H22	100 (3)
O1g—C1g—H1g	110.0	H31—OW3—H32	109 (3)
O5g—C1g—H1g	110.0	H41—OW4—H42	114 (4)
C2g—C1g—H1g	110.0

O5m—C1m—C2m—O2m	−67.68 (19)	O1g—C1g—C2g—C3g	169.66 (17)
O3g—C1m—C2m—O2m	168.72 (15)	O5g—C1g—C2g—C3g	51.9 (2)
O5m—C1m—C2m—C3m	53.6 (2)	O2g—C2g—C3g—O3g	72.5 (2)
O3g—C1m—C2m—C3m	−70.0 (2)	C1g—C2g—C3g—O3g	−167.17 (16)
O2m—C2m—C3m—O3m	−55.7 (2)	O2g—C2g—C3g—C4g	−167.15 (17)
C1m—C2m—C3m—O3m	−172.58 (15)	C1g—C2g—C3g—C4g	−46.8 (2)
O2m—C2m—C3m—C4m	65.4 (2)	O5m—C1m—O3g—C3g	85.18 (19)
C1m—C2m—C3m—C4m	−51.4 (2)	C2m—C1m—O3g—C3g	−151.40 (15)
O3m—C3m—C4m—O4m	−64.6 (2)	C4g—C3g—O3g—C1m	112.63 (18)
C2m—C3m—C4m—O4m	172.00 (15)	C2g—C3g—O3g—C1m	−124.11 (18)
O3m—C3m—C4m—C5m	176.70 (14)	O3g—C3g—C4g—O4g	−66.67 (19)
C2m—C3m—C4m—C5m	53.31 (19)	C2g—C3g—C4g—O4g	171.85 (17)
O4m—C4m—C5m—O5m	−175.11 (16)	O3g—C3g—C4g—C5g	172.82 (14)
C3m—C4m—C5m—O5m	−56.29 (19)	C2g—C3g—C4g—C5g	51.3 (2)
O4m—C4m—C5m—C6m	64.5 (2)	O4g—C4g—C5g—O5g	−178.89 (16)
C3m—C4m—C5m—C6m	−176.72 (17)	C3g—C4g—C5g—O5g	−59.2 (2)
O3g—C1m—O5m—C5m	61.40 (19)	O4g—C4g—C5g—C6g	60.8 (2)
C2m—C1m—O5m—C5m	−59.44 (19)	C3g—C4g—C5g—C6g	−179.52 (18)
C6m—C5m—O5m—C1m	−174.57 (16)	O1g—C1g—O5g—C5g	178.17 (15)
C4m—C5m—O5m—C1m	60.76 (18)	C2g—C1g—O5g—C5g	−64.0 (2)
O5m—C5m—C6m—O6m	−64.9 (2)	C6g—C5g—O5g—C1g	−169.21 (17)
C4m—C5m—C6m—O6m	57.2 (2)	C4g—C5g—O5g—C1g	66.8 (2)
O5g—C1g—O1g—C7	−71.2 (2)	O5g—C5g—C6g—O6g	−69.7 (2)
C2g—C1g—O1g—C7	168.7 (2)	C4g—C5g—C6g—O6g	50.1 (2)
O1g—C1g—C2g—O2g	−72.2 (2)	H1m—C1m—O3g—C3g	−34
O5g—C1g—C2g—O2g	170.02 (16)	C1m—O3g—C3g—H3g	−5

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O2m—H2m1···O3mⁱ	0.82	1.96	2.732 (2)	156
O3m—H3m1···O6mⁱⁱ	0.82	1.89	2.705 (2)	172
O4m—H4m1···OW4ⁱⁱⁱ	0.82	2.03	2.803 (2)	158
O6m—H6m···OW3^iv	0.82	2.00	2.796 (2)	166
O2g—H2g1···O4m^v	0.82	2.25	2.848 (2)	130
O2g—H2g1···O3m^v	0.82	2.43	3.140 (2)	145
O4g—H4g1···OW2^vi	0.82	1.91	2.733 (2)	177
O6g—H6g···OW1^vi	0.82	2.00	2.794 (2)	162
OW1—H11···O4g	0.94 (2)	1.80 (2)	2.736 (2)	174 (4)
OW1—H12···OW2	0.97 (2)	1.92 (3)	2.834 (2)	156 (2)
OW2—H21···OW3	0.92 (2)	1.98 (2)	2.866 (2)	161 (4)
OW2—H22···O2g^vi	0.90 (3)	2.06 (3)	2.915 (2)	159 (4)
OW3—H31···O1g^vii	0.91 (3)	1.94 (3)	2.814 (2)	163 (4)
OW3—H32···OW4	0.90 (2)	1.92 (2)	2.807 (2)	167 (4)
OW4—H41···O6g^vii	0.89 (2)	2.04 (2)	2.916 (2)	168 (3)
OW4—H42···O2m^vi	0.89 (2)	1.88 (3)	2.747 (2)	163 (4)

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

Experimental details

Crystal data
Chemical formula	C₁₃H₂₄O₁₁·4H₂O
M_r	428.39
Crystal system, space group	Monoclinic, C2
Temperature (K)	291
a, b, c (Å)	18.275 (3), 7.7293 (12), 13.910 (3)
β (°)	97.87 (2)
V (Å³)	1946.4 (6)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	0.14
Crystal size (mm)	0.40 × 0.30 × 0.15

Data collection
Diffractometer	Stoe IPDS diffractometer
Absorption correction	Numerical (X-RED; Stoe & Cie, 1997)
T_min, T_max	0.95, 0.98
No. of measured, independent and observed [I > 2σ(I)] reflections	8973, 2017, 1706
R_int	0.037
(sin θ/λ)_max (Å⁻¹)	0.613

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.025, 0.059, 0.99
No. of reflections	2017
No. of parameters	287
No. of restraints	9
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρ_max, Δρ_min (e Å⁻³)	0.13, −0.14

Computer programs: EXPOSE (Stoe & Cie, 1997), CELL (Stoe & Cie, 1997), INTEGRATE (Stoe & Cie, 1997), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), DIAMOND (Bergerhoff, 1996), PLATON (Spek, 2003).

Selected geometric parameters (Å, º) top

H1m—H3g	2.12

H11—OW1—H12	105 (3)	H31—OW3—H32	109 (3)
H21—OW2—H22	100 (3)	H41—OW4—H42	114 (4)

O5m—C5m—C6m—O6m	−64.9 (2)	C4g—C3g—O3g—C1m	112.63 (18)
C4m—C5m—C6m—O6m	57.2 (2)	C2g—C3g—O3g—C1m	−124.11 (18)
O5g—C1g—O1g—C7	−71.2 (2)	O5g—C5g—C6g—O6g	−69.7 (2)
C2g—C1g—O1g—C7	168.7 (2)	C4g—C5g—C6g—O6g	50.1 (2)
O5m—C1m—O3g—C3g	85.18 (19)	H1m—C1m—O3g—C3g	−34
C2m—C1m—O3g—C3g	−151.40 (15)	C1m—O3g—C3g—H3g	−5

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O2m—H2m1···O3mⁱ	0.82	1.962	2.732 (2)	156
O3m—H3m1···O6mⁱⁱ	0.82	1.890	2.705 (2)	172
O4m—H4m1···OW4ⁱⁱⁱ	0.82	2.027	2.803 (2)	158
O6m—H6m···OW3^iv	0.82	1.995	2.796 (2)	166
O2g—H2g1···O4m^v	0.82	2.249	2.848 (2)	130
O2g—H2g1···O3m^v	0.82	2.434	3.140 (2)	145
O4g—H4g1···OW2^vi	0.82	1.913	2.733 (2)	177
O6g—H6g···OW1^vi	0.82	2.002	2.794 (2)	162
OW1—H11···O4g	0.94 (2)	1.80 (2)	2.736 (2)	174 (4)
OW1—H12···OW2	0.97 (2)	1.92 (3)	2.834 (2)	156 (2)
OW2—H21···OW3	0.92 (2)	1.98 (2)	2.866 (2)	161 (4)
OW2—H22···O2g^vi	0.90 (3)	2.06 (3)	2.915 (2)	159 (4)
OW3—H31···O1g^vii	0.91 (3)	1.94 (3)	2.814 (2)	163 (4)
OW3—H32···OW4	0.90 (2)	1.92 (2)	2.807 (2)	167 (4)
OW4—H41···O6g^vii	0.89 (2)	2.04 (2)	2.916 (2)	168 (3)
OW4—H42···O2m^vi	0.89 (2)	1.88 (3)	2.747 (2)	163 (4)

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

Acknowledgements

This work was supported by a grant from the Swedish Research Council (VR).

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