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