1 9TK 1-methylimidazole-2-carboxylic acid 1.000 2 IMT 4-amino-(1-methylimidazole)-2-carboxylic acid 0.900 3 HKR 1-propylimidazole-2-carboxylic acid 0.818 4 HKU 1-propan-2-ylimidazole-2-carboxylic acid 0.818 5 3BY 1-methyl-L-proline 0.800 6 BVG 1h-imidazol-2-ylmethanol 0.778 7 DMI 2,3-dimethylimidazolium ion 0.778 8 HL3 1-[(2~{R})-butan-2-yl]imidazole-2-carboxylic acid 0.750 9 HLF 1-but-3-enylimidazole-2-carboxylic acid 0.750 10 6IW (2s,4s)-1-methyl-4-oxidanyl-pyrrolidine-2-carboxylic acid 0.727 11 87I (2r,4r)-1-methyl-4-hydroxyl-pyrrolidine-2-carboxylic acid 0.727 12 FPK 1-formyl-L-proline 0.727 13 N80 1-ethenyl-L-proline 0.727 14 O9B (2~{R})-1-methylpiperidine-2-carboxylic acid 0.727 15 PBE 1,1-dimethyl-prolinium 0.727 16 PYB 4-amino-(1-methylpyrrole)-2-carboxylic acid 0.727 17 2PC 3,4-dihydro-2h-pyrrolium-5-carboxylate 0.700 18 8LJ (2s)-2,3-dihydro-1h-pyrrole-2-carboxylic acid 0.700 19 A1CAB (2s)-3,4-dihydro-2h-pyrrole-2-carboxylic acid 0.700 20 DPR D-proline 0.700 21 PRO Proline 0.700 22 PYC Pyrrole-2-carboxylate 0.700 23 T2C (2s)-1,3-thiazolidine-2-carboxylic acid 0.700