Ethyl 5-(aminomethyl)-2-(difluoromethyl)-3-methoxypyridine-4-acetate
Ethyl 4-(aminomethyl)-5-(difluoromethyl)-2-methoxypyridine-3-acetate
Ethyl 4-(aminomethyl)-3-(difluoromethyl)-6-methoxypyridine-2-acetate
Ethyl 4-(aminomethyl)-5-(difluoromethyl)-3-methoxypyridine-2-acetate