C=C1C(=O)C(O)=C[C@@H]2[C@@]3(C)CC[C@](C)(C(=O)O)C[C@@H]3CC[C@]12C	(5S*,8S*,9S*,10R*,13S*)-2-hydroxy-16-nor-3-oxodolabr-1,4(18)-dien-15-oic acid