Abstract
The title ketocarboxylic acid [systematic name: (5R,8R,9S,10S,13R,14S,17R,20R)-3-oxo-24-norcholanic acid], C(23)H(36)O(3), forms acid-to-acid hydrogen-bonding chains [O...O = 2.620 (2) A and O-H...O = 163 (3) degrees ] in which all carboxyl groups adopt the rare anti conformation, while the ketone group does not participate in the hydrogen bonding. The occurrence and energetics of this conformation are discussed. One intermolecular C-H...O close contact exists, which plays a role in stabilizing the hydrogen-bonding arrangement.
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