2-(4-Pyridinyl)-1,3-thiazole-4-carboxylic acid2-(4-pyridyl)-1,3-thiazole-4-carboxylic acid2-(4-Pyridyl)thiazole-4-carboxylic acid2-(pyridin-4-yl)thiazole-4-carboxylic acid2-(4-PYRIDYL)THIAZOLE-4-CARBOXYLIC ACID2-(4-吡啶基)噻唑-4-羧酸2-(Pyridin-4-yl)-1,3-thiazole-4-carboxylic acid