Ethyl 3-(difluoromethyl)-4-methoxy-2-nitropyridine-6-carboxylate
Ethyl 3-(difluoromethyl)-2-methoxy-6-nitropyridine-5-carboxylate
Ethyl 2-(difluoromethyl)-4-methyl-3-nitropyridine-6-acetate
Ethyl 2-(difluoromethyl)-6-methyl-5-nitropyridine-3-carboxylate