1 D8D 1-[(1r)-1-cyclohexyl-2-(methylamino)-2-oxoethyl]-L-proline 1.000 2 A1JEV (2~{S})-1-[(1~{R})-1-(4-chlorophenyl)-2-(methylamino)-2-oxidanylidene-ethyl]pyrrolidine-2-carboxylic acid 0.950 3 11Q 1-(cyclohexylmethyl)-L-proline 0.789 4 A1A2J (2s,4s)-4-amino-1-benzoylpyrrolidine-2-carbaldehyde 0.714 5 87L (2s)-2-phenyl-2-pyrrol-1-yl-ethanoic acid 0.700 6 FZX 1-(phenylmethyl)imidazole-2-carboxylic acid 0.700