TSTU; 2-(2,5-dioxopyrrolidin-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate; CAS No.: 105832-38-0; ChemShuttle, a chemical synthesis company, provides 2-(2,5-dioxopyrrolidin-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate, a reagent for peptide synthesis. The company s Small molecules synthesis capabilities support drug discovery and process optimization.