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