COC(=O)/C1=C/CC[C@]2(C)O[C@H]2CC/C(C)=C/[C@@H]2OC(=O)C(C)=C2CC1	methyl (1S,2E,6S,8S,11E)-3,8,16-trimethyl-17-oxo-7,18-dioxatricyclo[13.3.0.06,8]octadeca-2,11,15-triene-12-carboxylate