1,4-pentalenedicarbonitrile, 2,3,5,6-tetrahydro- 2,3,5,6-tetrahydropentalene-1,4-dicarbonitrile InChI=1/C10H8N2/c11-5-7-1-3-9-8(6-12)2-4-10(7)9/h1-4H