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