Synonyms: Pyrrolidine,1-[[(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]acetyl]-2,5-dimethyl-,21-acetate (7CI); 2,7-(Epoxypentadeca[1,11,13]trienimino)naphtho[2,1-b]furan,rifamycin deriv.; NCI 143-439