C=C(C)[C@@H]1CC[C@]2(C)O[C@H]2CC/C(C)=C/C[C@H](O)[C@]2(C)O[C@H]2C1 (1S,3R,6S,8S,11E,14S,15S)-6,11,15-trimethyl-3-(prop-1-en-2-yl)-7,16-dioxatricyclo[13.1.0.0^{6,8}]hexadec-11-en-14-ol