72265-90-8 Combimicin B(sub 2) D-Streptamine, O-3-deoxy-4-C-methyl-3-(methylamino)-alpha-D-galactopyranosyl-(1-6)-O-(2,6-diamino-2,3,4,6-tetradeoxy-alpha-D-erythro-hexopyranosyl-(1-4))-2-deoxy-