Methyl 2-amino-4-(difluoromethyl)-3-nitropyridine-5-carboxylate
Methyl 2-amino-3-(difluoromethyl)-5-nitropyridine-6-carboxylate
4-Amino-2-(difluoromethyl)-3-nitropyridine-6-carboxylic acid
Methyl 2-amino-3-(difluoromethyl)-4-nitropyridine-5-carboxylate