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