zu – um zu … verbs with zu as a prefix

Hi, Emmanuel

When one uses a zu-infinitive with a verb that has a separable prefix, the zu is inserted between the prefix and the verb. But what if the prefix is “zu” (or “hinzu”)? For instance, if you wanted to say “It is easy to add it to the list”, would you say

“Es ist leicht, das zu die Liste hinzuzufügen”?

(asked by Bram)