1 V6F (4r)-1-acetyl-4-hydroxy-N-methyl-L-prolinamide 1.000 2 IS6 (2r)-N-(3-bromanylprop-2-ynyl)-1-ethanoyl-pyrrolidine-2-carboxamide 0.750 3 N7P 1-acetyl-L-proline 0.714 4 N8P N-acetyl-D-proline 0.714