Ethyl 3-(difluoromethyl)-6-methoxy-4-(trifluoromethoxy)pyridine-2-carboxylate
Ethyl 5-(difluoromethyl)-3-methoxy-4-(trifluoromethoxy)pyridine-2-carboxylate
Ethyl 5-(difluoromethyl)-4-methoxy-3-(trifluoromethoxy)pyridine-2-carboxylate
Ethyl 3-(difluoromethyl)-4-methoxy-2-(trifluoromethoxy)pyridine-5-carboxylate