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