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