1 4CS (4s)-2-methyl-1,4,5,6-tetrahydropyrimidine-4-carboxylic acid 1.000 2 6CS (4s,5s)-5-hydroxy-2-methyl-1,4,5,6-tetrahydropyrimidine-4-carboxylic acid 0.909 3 6SM 5-chloranylpyrimidine-4-carboxylic acid 0.818 4 A1EFO 6-methylpyridine-2-carboxylic acid 0.818 5 TJJ 2-oxo-2,3-dihydropyrimidine-4-carboxylic acid 0.818 6 A1IM4 2-(iminomethyl)pyridine-4-carboxylic acid 0.750 7 DOR (4s)-2,6-dioxohexahydropyrimidine-4-carboxylic acid 0.750 8 OG6 6-[bis(oxidanyl)methyl]-5~{H}-pyrimidine-2,4-dione 0.750 9 ORO Orotic acid 0.750 10 TEV 6-methyl-2-oxo-2,5-dihydropyrimidine-4-carboxylic acid 0.750 11 ZY9 6-(aminomethyl)pyridine-2-carboxylic acid 0.750 12 6PC Pyridine-2-carboxylic acid 0.727 13 7NW 2-methyl-1,3-thiazole-4-carboxylic acid 0.727 14 CPI 6-carboxypiperidine 0.727 15 MN1 4-carboxypiperidine 0.727 16 S3V Pyridine-4-carboxylic acid 0.727 17 YCP (2s)-piperidine-2-carboxylic acid 0.727