CC1=C(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*)-3-hydroxy-16-nor-2-oxodolabr-3-en-15-oic acid