6'-Methylgentamicin-A 66322-27-8 Antibiotic II-2 II-2 Streptamine, O-2-amino-2,7-dideoxy-D-glycero-alpha-D-gluco-heptopyranososyl-(1-4)-O-3-deoxy-3-(methylamino)-beta-L-arabinopyranosyl-(1-6)-2-deoxy-, D-