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