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Abstract
The asymmetric unit of the title solvate, C20H25ClO9S·0.25CH3OH, contains one galactopyranosyl derivative and one-quarter of a methanol solvent molecule. The galactopyranose ring is in the usual 4 C 1 conformation, and the anomeric center of the sugar has a β configuration. The value of θ (3.44°) and the range of torsion angles [or 53.1 (5)–63.0 (5)°] reflect a slight distortion of the 4 C 1 pyranose ring. A minor orientational disorder affects a carbonyl group, which was modeled with two sites for the O atom having occupancies of 0.79 (5) and 0.21 (5). The crystal studied exhibited inversion twinning.
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