JI-2OB;antibiotic JI 20B;4-O-(2,6-Diamino-2,6,7-trideoxy-α-L-glycero-D-gluco-heptopyranosyl)-6-O-[4-C-methyl-3-(methylamino)-3-deoxy-β-L-arabinopyranosyl]-2-deoxy-D-streptamine;D-Streptamine, O-3-deoxy-4-C-methyl-3-(methylamino)-β-L-arabinopyranosyl-(1→6)-O-[2,6-diamino-2,6,7-trideoxy-D-glycero-α-D-gluco-heptopyranosyl-(1→4)]-2-deoxy-