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