17607-46-4 4-O-(2-Oxo-2-(trimethylhydrazino)ethyl)rifamycin Acetic acid, ((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)-,trimethylhydrazide, 21-acetate BRN 5418455 NCI 144-132 NSC 144132 Rifamycin B trimethylhydrazide Rifamycin, 4-O-(2-oxo-2-(trimethylhydrazino)ethyl)- (9CI)