1,2-Benzenedicarbonitrile, 3,6-dihydroxy- 2,3-Dicyano-p-hydroquinone 2,3-Dicyanobenzene-1,4-diol 2,3-Dicyanohydroquinone 3,6-Dihydroxyphthalodinitrile 4733-50-0 NSC43554 Phthalonitrile, 3,6-dihydroxy-