Structural formula of the chemical compound <a href="https://en.wikipedia.org/wiki/4,4%27-bipyridine" class="extiw" title="w:4,4'-bipyridine">4,4'-bipyridine</a> (bipyridyl, dipyridine, dipyridyl).
<a href="//commons.wikimedia.org/wiki/User:Bryan_Derksen" title="User:Bryan Derksen">User:Bryan Derksen</a>
2007-01-11
<span class="int-own-work" lang="en">Own work</span>, made with BKchem