(S)-NCbz-(α-Me)Ser(OH)-OMe

methyl (S)-2-((2R,3S,4R)-2,4-diacetoxy-3-methylpentanoylamino)-3-hydroxy-3-methylpropanoate

methyl (S)-4-methyl-2-oxooxazolidine-4-carboxylate

(2R,3S,4R)-2,4-Diacetoxy-3-methyl-pentanoic acid (S)-2-amino-2-methoxycarbonyl-propyl ester

(S)-2-tert-butoxycarbonylamino-2-methoxycarbonylpropyl (2R,3S,4R)-2,4-diacetoxy-3-methylpentanoate