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