16784-10-4 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-methyl-N-propyl-, 21-acetate BRN 5418339 NCI 143-427 Rifamycin B methylpropylamide Rifamycin, 4-O-(2-(methylpropylamino)-2-oxoethyl)- (9CI)