(p-Phenylenedimethylene)dimalononitrile 1,4-Bis(2',2'-dicyanovinyl)benzene 17239-69-9 Malononitrile, (p-phenylenedimethylidyne)di- NSC57670 Propanedinitrile, 2,2'-(1,4-phenylenedimethylidyne)bis-