16784-05-7 Acetamide, 2-[[1,2-dihydro-5,6,17,19,21-pentahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-1,11-dioxo-2,7-(epoxypentadeca[1,11,13]trienimino)naphtho[2,1-b]furan-9-yl]oxy]-N,N-diisobutyl-, 21-acetate NSC146721 Rifamycin B diisobutylamide Rifamycin, 4-O-[2-[bis(2-methylpropyl)amino]-2-oxoethyl]-