12H-3,5a-Epoxy-5H-furo[3,4-i]oxepino[4,3-a]- xanthen-12-one,1-(acetyloxy)-1,2,3,6,7,7a,10,- 14,14a,14b-decahydro-6-hydroxy-3,13- dimethoxy-5,5,7a,9,14b-pentamethyl-,(1R,3S,- 5aR,6R,7aS,14aR,14bS)-