2,2'-buta-1,3-diyne-1,4-diyldipyridine InChI=1/C14H8N2/c1(7-13-9-3-5-11-15-13)2-8-14-10-4-6-12-16-14/h3-6,9-12 pyridine, 2,2'-(1,3-butadiyne-1,4-diyl)bis-