C=C1C(=O)O[C@]2(C)CC[C@@H]1C[C@H](OC(C)=O)[C@@]1(C)CC[C@H](O1)C(=C)CC[C@H]2OC(C)=O	(1R,3S,4R,7S,11R,12R)-3-(acetyloxy)-4,12-dimethyl-8,15-dimethylidene-14-oxo-13,18-dioxatricyclo[10.3.2.1^{4,7}]octadecan-11-yl acetate