Synonyms: Acetamide,N,N-dibutyl-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]-,21-acetate (7CI,8CI);2,7-(Epoxypentadeca[1,11,13]trienimino)naphtho[2,1-b]furan, rifamycin deriv.;NCI 143-426; Rifamycin B dibutylamide