C=C[C@H]1CC[C@H]2[C@@H]3CC[C@H]4CC(=O)[C@@H]5O[C@@H]5[C@]4(C)[C@H]3CC[C@]12C	(1S,2S,3R,5R,8S,11S,12S,15R,16R)-15-ethenyl-2,16-dimethyl-4-oxapentacyclo[9.7.0.02,8.03,5.012,16]octadecan-6-one