1-D-2-D-Fortimicin B 1-Deamino-2-deoxyfortimicin B 81166-14-5 beta-L-Lyxo-heptopyranoside, 2-hydroxy-4-methoxy-3-(methylamino)cyclohexyl 2,6-diamino-2,3,4,6,7-pentadeoxy-, (1R-(1alpha,2beta,3beta,4alpha))-