Methyl 6-(difluoromethyl)-4-methoxy-2-nitropyridine-3-carboxylate
Methyl 6-(difluoromethyl)-4-methoxy-3-nitropyridine-2-carboxylate
Methyl 2-(difluoromethyl)-4-methoxy-3-nitropyridine-6-carboxylate
4-(Difluoromethyl)-2-methyl-3-nitropyridine-6-acetic acid