C=C1CCC2=C(C)CO[C@H]2/C=C(\C)CC[C@@H]2O[C@@]2(C)CC[C@H]1O (1S,2E,6S,8S,11R)-3,8,16-trimethyl-12-methylidene-7,18-dioxatricyclo[13.3.0.06,8]octadeca-2,15-dien-11-ol