Sodium triethylborohydride

Sodium triethylborohydride is an organoboron compound with the formula NaBH(C2H5)3. It is a colorless, pyrophoric solid that is commercially available in toluene solution, unlike the related LiBH(C2H5)3 which is typically sold as a THF solution.

Source: Wikipedia — Sodium triethylborohydride (CC BY-SA 4.0)