1,2-benzenedicarbonitrile, 3,6-dihydroxy- 2,3-dicyanohydroquinone 2,6-dihydroxyphtalonitrile 3,6-dihydroxyphthalonitrile 4733-50-0 InChI=1/C8H4N2O2/c9-3-5-6(4-10)8(12)2-1-7(5)11/h1-2,11-12