Regiospecific introduction of a branched-chain to kanamycin B and stereospecific transformation of the 2,6-diamino-2,6-dideoxy-D-glucopyranosyl moiety into 2,6-diamino-2,3,4,6-tetradeoxy-3-C-methyl-L-arabino or lyxo-hexopyranosyl, or 2-amino-2,3,4,6-tetra

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