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