Methyl 2-(difluoromethyl)-5-methoxy-6-nitropyridine-3-carboxylate
Methyl 2-(difluoromethyl)-3-methoxy-5-nitropyridine-4-carboxylate
3-(Difluoromethyl)-2-methyl-5-nitropyridine-4-carboxylic acid
Ethyl 6-(difluoromethyl)-3-methyl-2-nitropyridine-4-carboxylate