C/C=C(\C)C(=O)O[C@@H]1[C@H]2C(=C(C)[C@@H](CC(=O)OC)C1(C)C)O[C@]1(O)CC[C@]3(C)C(=CC(=O)O[C@H]3c3ccoc3)[C@@]1(O)[C@@H]2OC(C)=O xylogranatin A