Ethyl 6-amino-4-(difluoromethyl)-3-fluoropyridine-2-carboxylate
Ethyl 2-amino-3-(difluoromethyl)-4-fluoropyridine-5-carboxylate
Methyl 4-amino-2-(difluoromethyl)-3-fluoropyridine-5-carboxylate
Methyl 5-amino-4-(difluoromethyl)-3-fluoropyridine-2-carboxylate