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