1 21A 6-(4-fluorophenyl)-5-[4-(1h-tetrazol-5-yl)phenyl]pyridine-2,3-diol 1.000 2 1ZQ 5,6-bis(4-fluorophenyl)pyridine-2,3-diol 0.778 3 KKV 4-[2-(4-fluorophenyl)-5-hydroxy-6-oxo-1,6-dihydropyridin-3-yl]benzoic acid 0.724