53448-69-4 Butirosin A sulfate Streptamine, O-2,6-diamino-2,6-dideoxy-alpha-D-glucopyranosyl-(1-4)-O-(beta-D-xylofuranosyl-(1-5))-N(sup 1)-(4-amino-L-2-hydroxybutyryl)-2-deoxy-, (S)-, sulfate (salt)