Sodium triacetoxyborohydride
Sodium triacetoxyborohydride, also known as sodium triacetoxyhydroborate, commonly abbreviated STAB, is a chemical compound with the formula Na[(CH3COO)3BH]. Like other borohydrides, it is used as a reducing agent in organic synthesis.
Source: Wikipedia — Sodium triacetoxyborohydride (CC BY-SA 4.0)