O,O,O',O'-tetrapropyl pyrophosphorothioate, Caswell No. 845A, Propyl thiopyrophosphate, ASPON, Tetra-O-propyl-1,2-dithio-phosphat, 1,2-dithio-diphosphoric acid tetra-O-propyl ester, ENT 16,894, ASP 51, Tetrapropyl thiodiphosphate, 1,2-Dithio-diphosphorsaeure-tetra-O-propylester, Stauffer asp-51, Tetra-n-propyl dithionopyrophosphate, A 42, Tetra-n-propyl dithiopyrophosphate