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organic compounds
The crystal structure of the title compound, (±)-cis-2-oxoperhydronaphthalene-4a-acetic acid, C12H18O3, involves hydrogen-bonding catemers. Hydrogen bonds progress from the carboxyl group of one molecule to the ketone group of a translationally related neighbor [OO 2.715 (3) Å]. Eight parallel hydrogen-bonding chains proceed in the a direction through the chosen cell. Two C=OH—C close contacts were found, involving the acid carbonyl group.