O-(BICYCLO[2.2.1]HEPT-5-ENE-2,3-DICARBOXIMIDO)-N,N,N,N-TETRAMETHYLURONIUM TETRAFLUOROBORATE;O-(5-NORBORNENE-2,3-DICARBOXIMIDO)-N,N,N,N-TETRAMETHYLURONIUM TETRAFLUOROBORATE;O-(5-NORBORNENE-2,3-DICARBOXIMIDO)-TETRAMETHYLURONIUM TETRAFLUOROBORATE;TNTU;TNTU T