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:Su-no-G" title="User:Su-no-G">Su-no-G</a>
2006-11-16
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