2-溴-4-甲酸乙酯吡啶

2,2'-联吡啶-4,4'-二甲酸

2-溴-4-吡啶羧酸

2,2'-联吡啶-4,4'-二甲酸甲酯

2-(dimethylamino)pyridine-4-carboxylic acid