2-(Aminomethyl)-3-(difluoromethyl)-5-hydroxypyridine-4-carboxylic acid
3-(Difluoromethyl)-2-hydroxy-6-nitropyridine-5-sulfonyl chloride
3-(Difluoromethyl)-2-hydroxy-4-methylpyridine-6-acetic acid
6-(Difluoromethyl)-2-hydroxy-3-nitropyridine-4-sulfonyl chloride