Synonyms: Rifamycin B butyldiethylhydrazide;BRN 5418777;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)-,1-butyl-2,2-diethylhydrazide, 21-acetate;LS-11771;17607-50-0