2H-(1,6)Dioxacyclotridecino(2,3,4-gh)pyrrolizine-2,8(5H)-dione,6,7,10,12,14,15,15a,15b-octahydro-7-hydroxy-4,6,7-trimethyl-, (3Z,6R,7R,15aR,15bR)- 74217-57-5