the syntheses of 1-n- ( s-4-amino-2-hydroxybutyryl ) -gentamicin b and 1-n- ( s-3-amino-2-hydroxypropionyl ) -gentamicin b , designated sch 20287 and sch 21420 , respectively , by procedures similar to those developed by kawaguchi and co-workers for the transformation of kanamycin a to amikacin are described .
C0022487
kanamycin
C0002499
amikacin