Methyl 2-(difluoromethyl)-3-hydroxy-6-nitropyridine-4-carboxylate
5-(Chloromethyl)-2-(difluoromethyl)-3-hydroxypyridine-4-carboxaldehyde
2-(Difluoromethyl)-6-hydroxy-3-nitropyridine-5-acetic acid
4-(Aminomethyl)-2-(difluoromethyl)-3-hydroxypyridine-6-carboxylic acid