https://wtt-pro.nist.gov/wtt-pro/index.html?cmp=hexahydro-1.2.4-methenopentalene-5.5.6.6-tetracarbonitrile
hexahydro-1,2,4-methenopentalene-5,5,6,6-tetracarbonitrile -- Critically Evaluated Thermophysical...
https://webbook.nist.gov/cgi/cbook.cgi?ID=C1625849&Mask=8
9,10-Dihydro-9,10-ethanoanthracene-11,11,12,12-tetracarbonitrile