CC(=O)O[C@@H]1C[C@H]2C(C)(C)[C@H](O)CC[C@]2(C)[C@H]2CC[C@]3(C)C(=CC[C@H]3[C@@H]3COC(=O)C3)[C@@]21C 1,2-dihydro-3α-hydroxy-turranolide