Benzyloxycarbonyl-L-proline, Carbobenzoxy-L-proline, N-[(phenyl-methoxy)carbonyl]-L-proline, Z-L-Proline, N-benzyloxycarbonyl-(S)-proline, 1,2-Pyrrolidinedicarboxylic acid, 1-(phenylmethyl) ester, (S)-, N-CBZ-L-PROLINE, (S)-1-(benzyloxycarbonyl)-pyrrolidine-2-carboxylic acid, Cbz-L-proline, (S)-N-(benzyloxycarbonyl)-proline, N-Carbobenzyloxy-l-Proline, (2S)-1-[(Phenylmethoxy)carbonyl]pyrrolidine-2-carboxylic acid, N-Carbobenzoxy-L-proline, N-Benzyloxycarbonyl-L-proline, Z-Pro-OH, Carbobenzyloxy-L-proline, (S)-1-carbobenzoxypyrrolidine-2-carboxylic acid