4''-Demethylgentamicin-C1 66322-28-9 Streptamine, O-2-amino-2,3,4,6,7-pentadeoxy-6-(methylamino)-alpha-D-ribo-heptopyranosyl-(1-4)-O-(3-deoxy-3-(methylamino)-beta-L-arabinopyranosyl-(1-6))-2-deoxy-, D-