65057-91-2 Antibiotic BU 2231B BU-2231B Bleomycinamide, N(sup 1)-(3-((4-aminobutyl)amino)propyl)-13-((4-amino-4,6-dideoxy-alpha-L-talopyranosyl)oxy)-19-demethyl-12-hydroxy- Talisomycin B Tallysomycin B