1,2,4,5-BENZENETETRACARBONITRILE 1,2,4,5-Benzenetetranitrile 1,2,4,5-Benzentetrakarbonitril [Czech] 1,2,4,5-Tetracyanobenzene 712-74-3 Pyromellitic acid tetranitrile Pyromellitic nitrile Pyromellitic tetranitrile Pyromellitonitrile (6CI) Pyromellitotetranitrile Tetracyanobenzene