What prefab is my game object an instance of?

At some point in the editor I create a number of GameObjects from prefabs I have in my Assets folder.

At a later point, still in editor mode, in an editor script, I have references to some of the GameObjects I created earlier. I know that they came from prefabs. It it possible to find out the name of the prefab that they came from?

Thanks

got it, EditorUtility.GetPrefabParent