title: cis-3,3-Dimethyl-3,3a,4,5,6,6a-hexa-hydro-1H-cyclo-penta-[c]furan-1,6-dione.
abstract: The bicyclic mol-ecule of the title compound, C(9)H(12)O(3), 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 inter-molecular C-H⋯O inter-actions, which link the mol-ecules into zigzag chains extended in the [010] direction. The unit cell contains a racemic mixture of enanti-omers.
authors.affiliation: Chemistry Department, United States Naval Academy, 572M Holloway Road, Annapolis, Maryland 21402, USA.
authors.forename: Wayne H
authors.initials: WH
authors.lastname: Pearson
authors.forename: Stacey E
authors.initials: SE
authors.lastname: Lanham
authors.forename: Debra K
authors.initials: DK
authors.lastname: Dillner