methyl 1-carbobenzyloxy-2S-pyrrolidinyl-αS-hydroxyacetate

methyl 1-carbobenzyloxy-2S-pyrrolidinyl-αS-(chloroacetylamino)acetate

(S)-benzyl 2-(4-aminophenylcarbamoyl)pyrrolidine-1-carboxylate

benzyl (2S)-2-[2-(tert-butoxycarbonyl)-5-(4-fluorophenyl)-3-oxopentanoyl]-1-pyrrolidinecarboxylate

benzyl (S)-2-((4-chloro-6-phenylpyrimidin-5-yl)carbamoyl)pyrrolidine-1-carboxylate