Ethyl 4,6-diamino-3-(trifluoromethoxy)pyridine-2-carboxylate
Ethyl 4-(difluoromethyl)-3-methyl-6-(trifluoromethoxy)pyridine-2-carboxylate
Ethyl 2,4-diamino-3-(trifluoromethoxy)pyridine-5-carboxylate
Ethyl 4-(difluoromethyl)-3-methyl-2-(trifluoromethoxy)pyridine-6-carboxylate