cis-3,3-Dimethyl-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-1,6-dione

The bicyclic molecule of the title compound, C9H12O3, contains two five-membered rings with different functional groups, viz. a ketone and an ester. Both rings assume an envelope conformation. The mean planes of these functional groups form a dihedral angle of 60.7 (1)°. The crystal structure exhibits weak intermolecular C—H...O interactions, which link the molecules into zigzag chains extended in the [010] direction. The unit cell contains a racemic mixture of enantiomers.