1,4-Benzenediacetonitrile 1,4-Bis(cyanomethyl)benzene 1,4-PHENYLENEDIACETONITRILE 622-75-3 NSC513731 p-(Cyanomethyl)benzyl cyanide p-Benzenediacetonitrile p-Bis(cyanomethyl)benzene p-Phenylenediacetonitrile p-Xylylene dicyanide