Synonyms: Rifamycin B, 2-(4-methylphenyl)hydrazide;106744-12-1;ho[2,1-b]furan-9-yl]oxy]-, 2-(4-methylphenyl)hydrazide;Acetic acid, (((2S,16S,17S,18R,19R,20R,21S,22R,23S)-21-(acetyloxy)-1,2-dihydro-5,6,17,19-tetrahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-1,11-dioxo-2,7-(epoxy(1,11,13)pentadecatrienoimino)naphtho(2,1-b)furan-9-yl)oxy)-, 2-(4-methylphenyl)hydrazide