1,2-Benzenedicarbonitrile 1,2-Benzodinitrile 1,2-Dicyanobenzene 91-15-6 NSC17562 Phthalic acid dinitrile Phthalodinitrile Phthalonitrile Usaf nd-09 WLN: NCR BCN o-Benzenedicarbonitrile o-Cyanobenzonitrile o-Dicyanobenzene o-PDN o-Phthalodinitrile