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