O-3-Deoxy-4-C-methyl-3-(methylamino)-β-L-arabinopyranosyl-(1-6)-O-[2,6-diamino-2,3,4,6-tetradeoxy-α-D-erythro-hexopyranosyl-(1-4)]-2-deoxy-D-streptamine Pentaacetate Salt; (Gentamicin C1a Pentaacetate Salt)