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