InChI=1/C14H8N4/c15-5-13(6-16)11-3-4-12(10-2-1-9(10)11)14(13,7-17)8-18/h1-4,9-12 tricyclo[4.2.2.0~2,5~]deca-3,9-diene-7,7,8,8-tetracarbonitrile