17607-49-7 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]-, 21-acetate, 2,2-dimethyl-1-propylhydrazide NSC144131 Rifamycin B dimethylpropylhydrazide Rifamycin, 4-O-[2-(2,2-dimethyl-1-propylhydrazino)-2-oxoethyl]-