4,4'-[1,4-phenylenedi(E)ethene-2,1-diyl]dipyridine InChI=1/C20H16N2/c1-2-18(6-8-20-11-15-22-16-12-20)4-3-17(1)5-7-19-9-13-21-14-10-19/h1-16H/b7-5+,8-6 pyridine, 4,4'-[1,4-phenylenedi(E)-2,1-ethenediyl]bis-