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