O-(NSuccinimidyl)-1,1,3,3-tetramethyluronium Tetrafluoroborate; N-[(Dimethylamino)[(2,5-dioxo-1-pyrrolidinyl)oxy]methylene]-N-methylmethanaminium Tetrafluoroborate(1-); N,N,N',N'-Tetramethyl-O-(NSuccinimidyl)uronium Tetrafluoroborate; O-(NSuccinimidyl)-N,N,N',N'-tetramethyluronium Tetrafluoroborate