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