Steffimycin;Steffimycin (USAN;4-[(2-O-Methyl-6-deoxy-α-L-mannopyranosyl)oxy]-3,4-dihydro-2,5,7-trihydroxy-3,9-dimethoxy-2-methyl-1,6,11(2H)-naphthacenetrione;4-[(6-Deoxy-2-O-methyl-α-L-mannopyranosyl)oxy]-3,4-dihydro-2,5,7-trihydroxy-3,9-dimethoxy-2-methyl-1,6,11(2H)-naphthacenetrione;Antibiotic U-20661;NSC-93419;Steffisburgensimycin