(9S,12E,14S,15R,16S,17R,18R,19R,20S,
21S,22E,24Z)-6,16,18,20-tetrahidroksi-1'-
isobutil-14-metoksi-7,9,15,17,19,21,25-
hepta-metil-spiro[9,4-(epoksipentadeka
[1,11,13]trienimino)-2H-furo-[2',3':7,8]-naft
[1,2-d]imidazol-2,4'-piperidin]-5,10,26-(3H,9H)-
triona-16-asetat