1,4-Benzenedicarbonitrile, 2,3,5,6-tetramethyl-, N,N'-dioxide 2904-60-1 EINECS 220-804-7 NSC 87614 Terephthalonitrile, tetramethyl-, N,N'-dioxide Terephthalonitrile, tetramethyl-, N,N'-dioxide (8CI) Tetramethylterephthalonitrile N,N'-dioxide