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