Synonyms: Acetamide,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]-N-methyl-N-propyl-,21-acetate (8CI); 2,7-(Epoxypentadeca[1,11,13]trienimino)naphtho[2,1-b]furan,rifamycin deriv.; NCI 143-427