Ethyl 3-(difluoromethyl)-2-methoxy-5-nitropyridine-4-carboxylate
Ethyl 6-(difluoromethyl)-2-methyl-4-nitropyridine-3-carboxylate
3-(Difluoromethyl)-5-methyl-2-nitro-4-(trifluoromethyl)pyridine
Ethyl 2-(difluoromethyl)-6-methyl-3-nitropyridine-5-carboxylate