kanamycins kanamycin B chebi_ontology CHEBI:28098 Bekanamycin CHEBI:6107 Kanamycin B 2'-amino-2'-deoxykanamycin Nebramycin V CHEBI:24949 CHEBI:14489 CHEBI:24948 Nebramycin factor 5 O-3-amino-3-deoxy-alpha-D-glucopyranosyl-(1->4)-O-(2,6-diamino-2,6-dideoxy-alpha-D-glucopyranosyl-(1->6))-2-deoxy-D-streptamine kanamycin B(5+)