1 PBE 1,1-dimethyl-prolinium 1.000 2 0XW (2s,4r)-4-hydroxy-1,1-dimethylpyrrolidinium-2-carboxylate 0.909 3 4OP (2s,4s)-2-carboxy-4-hydroxy-1,1-dimethylpyrrolidinium 0.909 4 3BY 1-methyl-L-proline 0.900 5 6IW (2s,4s)-1-methyl-4-oxidanyl-pyrrolidine-2-carboxylic acid 0.818 6 87I (2r,4r)-1-methyl-4-hydroxyl-pyrrolidine-2-carboxylic acid 0.818 7 FPK 1-formyl-L-proline 0.818 8 N80 1-ethenyl-L-proline 0.818 9 PYB 4-amino-(1-methylpyrrole)-2-carboxylic acid 0.818 10 2PC 3,4-dihydro-2h-pyrrolium-5-carboxylate 0.800 11 8LJ (2s)-2,3-dihydro-1h-pyrrole-2-carboxylic acid 0.800 12 DPR D-proline 0.800 13 PRO Proline 0.800 14 PYC Pyrrole-2-carboxylate 0.800 15 N7P 1-acetyl-L-proline 0.750 16 N8P N-acetyl-D-proline 0.750 17 3WX 2-methyl-L-proline 0.727 18 4FB (4s)-4-fluoro-L-proline 0.727 19 9TK 1-methylimidazole-2-carboxylic acid 0.727 20 DPL 4-oxoproline 0.727 21 FP9 (4r)-4-fluoro-L-proline 0.727 22 G8X (2~{S},3~{R})-3-oxidanylpyrrolidine-2-carboxylic acid 0.727 23 HY3 3-hydroxyproline 0.727 24 HYP 4-hydroxyproline 0.727 25 HZP (4s)-4-hydroxy-L-proline 0.727 26 JKH 4-amino-proline 0.727 27 MP8 (4r)-4-methyl-L-proline 0.727 28 PCA Pyroglutamic acid 0.727 29 PXU 2-hydroxy-L-proline 0.727 30 UY7 (4s)-4-hydroxy-D-proline 0.727 31 UYA (4r)-4-hydroxy-D-proline 0.727 32 8GZ D-prolinol 0.700 33 PRI Pyrrolidine-2-carbaldehyde 0.700