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