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