5H-Furo(3,4-i)oxepino(4,3-a)xanthene-3,12-dione,1,2,5a,6,7,7a,10,14,14a,14b-decahydro-5a-hydroxy-13-methoxy-5,5,7a,9,14b-pentamethyl-, (5aS,7aS,14aR,14bR)- 87833-51-0