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Acta Cryst. (2013). E69, o1186  [ doi:10.1107/S160053681301725X ]

Methyl 3-[(chloro­meth­oxy)carbon­yloxy]-7-hy­droxy­cholan-24-oate

J.-L. Zhong, W.-X. Sun, F.-L. Zhang, L.-H. Liu and H. Liu

Abstract: The title compound, C27H43ClO6, is a derivative of urso­deoxy­cholic acid, in which the OH group at the 3-position is substituted by a chloro­meth­oxy­carbon­yloxy substituent and the carb­oxy­lic acid group at the 24-position is methyl­ated. The A and B rings are cis-fused, while all other rings are trans-fused. In the crystal, two adjacent mol­ecules located along the b-axis direction are inter­locked head-to-tail due to weak C-H...O hydrogen bonds. Therefore each mol­ecule is linked to four neighbouring mol­ecules by four C-H...O hydrogen bonds, with the OH group at the 7-position and the carbonyl O atom of the ester group acting as the acceptor sites.

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