(2S)-4-Amino-N-{(1R,2S,3S,4R,5S)-5-amino-2-[(3-amino-3-deoxy-a-D-glucopyranosyl)oxy]-4-[(6-amino-6-deoxy-a-D-glucopyranosyl)oxy]-3-hydroxycyclohexyl}-2-hydroxybutanamide sulfate (1:2)