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