1,6,11(2H)-Naphthacenetrione, 4-[(6-deoxy-2,4-di-O-methyl-.alpha.-L-mannopyranosyl)oxy]-3,4-dihydro-2,5,7-trihydroxy-3,9-dimethoxy-2-methyl- 54526-94-2 NSC204855 STEFFIMYCIN B U 40615