Here's a breakdown:

* (NH₄)₃: This represents three ammonium ions (NH₄⁺).

* C₆H₅O₇: This represents one citrate ion (C₆H₅O₇³⁻).

Ammonium citrate is a salt formed by the reaction of citric acid (C₆H₈O₇) with ammonia (NH₃).