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