C=C1C(=O)O[C@]2(C)CC[C@@H]1C[C@@H]1O[C@@]1(C)CC[C@@H](O)[C@](C)(O)CCC2=O	(1R,3S,5S,8R,9R,13R)-8,9-dihydroxy-5,9,13-trimethyl-16-methylidene-4,14-dioxatricyclo[11.3.2.0^{3,5}]octadecane-12,15-dione