Ball-and-stick model of the <a href="https://en.wikipedia.org/wiki/Carbon_suboxide" class="extiw" title="w:Carbon suboxide">carbon suboxide</a> molecule
<a href="//commons.wikimedia.org/wiki/User:Benjah-bmm27" title="User:Benjah-bmm27">Benjah-bmm27</a> and <a href="//commons.wikimedia.org/wiki/User:Ephemeron" title="User:Ephemeron">Ephemeron</a>
Derivative of <a href="//commons.wikimedia.org/wiki/File:Carbon-dioxide-3D-balls.png" title="File:Carbon-dioxide-3D-balls.png">File:Carbon-dioxide-3D-balls.png</a>