5-Deoxygentamicin C(sub 1) 60768-21-0 D-Streptamine, O-2-amino-2,3,4,6,7-pentadeoxy-6-(methylamino)-alpha-D-ribo-heptopyranosyl-(1-4)-O-(3-deoxy-4-C-methyl-3-(methylamino)-beta-L-arabinopyranosyl-(1-6))-2,5-dideoxy-