Ball-and-stick model of the <a href="https://en.wikipedia.org/wiki/Alizarin" class="extiw" title="w:Alizarin">alizarin</a> molecule, a historically important red dye, which was the first natural pigment to be duplicated synthetically in 1869.
<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:Quinizarin-3D-balls.png" title="File:Quinizarin-3D-balls.png">File:Quinizarin-3D-balls.png</a> and <a href="//commons.wikimedia.org/wiki/File:Methanol-3D-balls.png" title="File:Methanol-3D-balls.png">File:Methanol-3D-balls.png</a>.