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