CC(C)(O)[C@@H]1O[C@@](C)([C@@H](O)CC[C@](C)(O)[C@H]2CC[C@H]3O[C@@H]([C@]4(C)CC[C@@H](Br)C(C)(C)O4)CC[C@]3(C)O2)C[C@@H]1O aplysiol A