N-Tosyl-L-aspartic acid α,β-dibenzyl ester
(S)-1-(tert-butoxycarbonyl)-4-methylenepyrrolidine-2-carboxylic acid
N-phenylsulphonyl-N-propargyl-O-tetrahydropyranyl-(S)-serine benzylester
N-phenylsulphonyl-N-propargyl-3-bromo-(S)-alanine benzylester
N-phenylsulphonyl-4-exomethylene-(S)-proline benzylester