Synonyms: Aceticacid,[(1,2-dihydro-5,6,16,19,21-pentahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-1,11,17-trioxo-2,7-(epoxypentadeca[1,11,13]trienimino)naphtho[2,1-b]furan-9-yl)oxy]-,21-acetate (8CI); 2,7-(Epoxypentadeca[1,11,13]trienimino)naphtho[2,1-b]furan,rifamycin deriv.; NSC 145655; Rifamycin Y