17555-11-2 2,7-(Epoxypentadeca(1,11,13)trienimino)naphtho(2,1-b)furan-1,11(2H)-dione, 2,4,12,16,18,20,22-heptamethyl-5,6,9,17,19,21-hexahydroxy-23-methoxy- 8-(methyl(tetrahydrofurfuryl)amino)-, 21-acetate