Received 1 June 2013
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-HO hydrogen bonds. Therefore each molecule is linked to four neighbouring molecules by four C-HO hydrogen bonds, with the OH group at the 7-position and the carbonyl O atom of the ester group acting as the acceptor sites.
Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: publCIF (Westrip, 2010).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: IM2434 ).
We gratefully acknowledge financial support from the National Natural Science Foundation of China (Nos. 81072530 and 30772653).
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