Ball and stick model of the <a href="https://en.wikipedia.org/wiki/18-crown-6" class="extiw" title="w:18-crown-6">18-crown-6</a> molecule.
<a href="//commons.wikimedia.org/wiki/User:Benjah-bmm27" title="User:Benjah-bmm27">Ben Mills</a> and <a href="//commons.wikimedia.org/wiki/User:Jynto" title="User:Jynto">Jynto</a>
Derived from <a href="//commons.wikimedia.org/wiki/File:18-crown-6-potassium-3D-vdW-A.png" title="File:18-crown-6-potassium-3D-vdW-A.png">File:18-crown-6-potassium-3D-vdW-A.png</a>.