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