(R)-2-(Methoxycarbonylmethyl-carbamoyl)-2-(2-oxo-ethyl)-pyrrolidine-1-carboxylic acid tert-butyl ester
Methyl N-(tert-Butoxycarbonyl)-2(R)-allylprolylglycinate
N-tert-butoxycarbonyl-L-α-allylproline
Methyl N-(tert-Butoxycarbonyl)-2(R)-(2-hydroxyethyl)prolylglycine