C[C@H]1C[C@@]2(O)[C@H]([C@H]1OC(=O)C1=CC=CC=C1)[C@@H](OC(C)=O)[C@@]1(CC3=C([C@H](OC(C)=O)C(C)(C)C3=O)[C@@](C)([C@@H]1OC(C)=O)[C@@H]2OC(C)=O)OC(C)=O