Ethyl 3-amino-2-(difluoromethyl)-5-methylpyridine-4-carboxylate
Ethyl 2-amino-5-(difluoromethyl)-6-methylpyridine-3-carboxylate
2-Amino-3-(chloromethyl)-5-(difluoromethyl)-4-iodopyridine
Ethyl 2-amino-4-(difluoromethyl)-5-methylpyridine-3-carboxylate