4,4'-buta-1,3-diyne-1,4-diyldipyridine InChI=1/C14H8N2/c1(3-13-5-9-15-10-6-13)2-4-14-7-11-16-12-8-14/h5-12 pyridine, 4,4'-(1,3-butadiyne-1,4-diyl)bis-