Ethyl 4-amino-2-cyano-3-(trifluoromethoxy)pyridine-5-carboxylate
Ethyl 3-amino-5-cyano-6-(trifluoromethoxy)pyridine-2-carboxylate
Ethyl 3-amino-5-cyano-4-(trifluoromethoxy)pyridine-2-carboxylate
Ethyl 3-amino-5-cyano-2-(trifluoromethoxy)pyridine-4-carboxylate