Uronium


TSTU (N,N,N’,N’-Tetramethyl-O-(N-succinimidyl)uronium tetrafluoroborate)


TOTU (O-[(Ethoxycarbonyl)cyanomethylenamino]-N,N,N’,N’- tetramethyluronium tetrafluoroborate)


TPTU (O-(2-Oxo-1(2H)pyridyl)-N,N,N’,N’-tetramethyluronium tetrafluoroborate)


TDBTU (O-(3,4-Dihydro-4-oxo-1,2,3-benzotriazin-3-yl)-N,N,N’,N’- tetramethyluronium tetrafluoroborate)