The cylooctenyl fragment of the title compound, C13H18O, adopts a twis
t-boat conformation. The torsion angle at the ring-fusion bond is 7.0(
2)degrees and that at the cyclooctene double bond is 0.0(2)degrees. Th
e cyclooctenyl C=C bond length is 1.325(3)Angstrom and the norbornenyl
C=C bond length is 1.323(2)Angstrom. In accord with the space-group s
ymmetry, four molecules are held together by hydrogen bonding, with an
intermolecular O ... O distance of 2.736 (1)Angstrom.