Tetrapropylammonium perruthenate
Tetrapropylammonium perruthenate (TPAP or TPAPR) is the chemical compound described by the formula N(C3H7)4RuO4. Sometimes known as the Ley–Griffith reagent, this ruthenium compound is used as a reagent in organic synthesis.
Source: Wikipedia — Tetrapropylammonium perruthenate (CC BY-SA 4.0)