Synonyms: O-(N-Succinimidyl)-1,1,3,3-tetramethyluronium tetrafluoroborate; TSTU, O-(N-Succinimidyl)-1,1,3,3-tetramethyluronium tetrafluoroborate; 2-Succinimido-1,1,3,3-tetramethyluronium tetrafluoroborate; TSTU; N,N,N,N-Tetramethyl-O-(N-succinimidyl)uronium tetrafluoroborate; 2-Succinimido-1,1,3,3-tetra-methyluronium tetrafluoroborate; 2-Succinimido-1,1,3,3-tetramethyluronium tetrafluoroborate