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