1,2-Benzenedicarbonitrile, 3,6-dihydroxy- (9CI) 2,3-Dicyano-p-hydroquinone 2,3-Dicyanobenzene-1,4-diol 2,3-Dicyanohydroquinone 3,6-Dihydroxyphthalodinitrile 3,6-Dihydroxyphthalonitrile 4733-50-0 AI3-18625 EINECS 225-241-0 NSC 43554 Phthalonitrile, 3,6-dihydroxy- (8CI)