(S)-4-(benzyl-benzyloxycarbonyl-amino)-3-benzyloxy-butyric acid

(2S,5R,6S)-2-(4-benzyloxycarbonyl-5,6-diphenyl-1,2,5,6-tetrahydro-4H-1,4-oxazin-2-yl)acetic acid

4-[(Benzyloxycarbonyl)amino]-3-hydroxybutanoic acid

(S)-3-tert-Butoxy-4-tert-butoxycarbonylamino-butyric acid

(-)-ethyl 3-cyano-3-hydroxypropionate