[H]\C(=C(\C)C(O)=O)C1([H])C[C@]([H])(C)[C@@]2(C)[C@@]([H])(O1)C=C1C(C(O)=O)=C(C[C@@]34CC[C@@]([H])(O3)C(C)(C)C4=O)C[C@]([H])(O)[C@]21C