CC(=O)O[C@H]1C[C@H]2[C@](C)([C@@H]3CC[C@]4(C)[C@H](CC=C4[C@@]13C)[C@@H]1COC(C)(C)[C@@H](O)[C@H](O)C1)[C@@H](CC(=O)OC2(C)C)OC(C)=O