C=C1C[C@@H]2[C@]3(C)C(=C(O)C(=O)[C@@]2(C)[C@]2(C(=O)OC)C(=O)O[C@H](C)C(=O)[C@@]12C)C(C)(C)C(=O)C[C@@H]3O	Terretonin E