... directly to an aromatic ring, giving it different acid/base and oxidative properties).The threonine residue is susceptible ... one single enantiomer, (2S,3R)-2-amino-3-hydroxybutanoic acid. The second stereoisomer (2S,3S), which is rarely ... 2R,3S)- and (2R,3R)-2-amino-3-hydroxybutanoic acid are only of minor importance.Package25kg/drum, double layers ... and strong light/heat. High Quality L-Threonine 99.0%