1,1,2,2-ethanetetracarbonitrile, 1,2-bis(4-methoxyphenyl)- 1,2-bis(4-methoxyphenyl)ethane-1,1,2,2-tetracarbonitrile InChI=1/C20H14N4O2/c1-25-17-7-3-15(4-8-17)19(11-21,12-22)20(13-23,14-24)16-5-9-18(26-2)10-6-16/h3-10H,1-2H