1-pentalenecarbonitrile, 3,3a,6,6a-tetrahydro- 3,3a,6,6a-tetrahydropentalene-1-carbonitrile InChI=1/C9H9N/c10-6-8-5-4-7-2-1-3-9(7)8/h1-2,5,7,9H,3-4H