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