1 581 2-[3-(acetylamino)phenyl]-5-hydroxy-6-oxo-1,6-dihydropyrimidine-4-carboxylic acid 1.000 2 S2X 2-(5-acetamido-2-oxidanyl-phenyl)pyridine-4-carboxylic acid 0.783 3 A1IA5 2-(4-chlorophenyl)-5-oxidanyl-6-oxidanylidene-1h-pyrimidine-4-carboxylic acid 0.773 4 7WH 2-[5-(2-methoxyethanoylamino)-2-oxidanyl-phenyl]pyridine-4-carboxylic acid 0.720