[H][C@@]1(C)OC(=O)[C@@]23C(=C)[C@@]4(C)OC(=O)[C@@]12O[C@]1(C(=C)[C@]2(C[C@]([H])(OC(C)=O)[C@@]31C)C=CC(=O)OC2(C)C)[C@@]4([H])OC(C)=O