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