10-Dihydrosteffimycin B 5,12-Naphthacenedione, 10-((6-deoxy-2,4-di-O-methyl-alpha-L-mannopyranosyl)oxy)-7,8,9,10-tetrahydro-1,7,8,11-tetrahydroxy-3,9-dimethoxy-8-methyl- 75086-97-4