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