The structure of Bilirubin
<a href="//commons.wikimedia.org/wiki/User:%D7%99%D7%95%D7%A1%D7%99_%D7%94%D7%A8%D7%90%D7%A9%D7%95%D7%9F" class="mw-redirect" title="User:יוסי הראשון">Yosi I</a>
based on <a href="//commons.wikimedia.org/wiki/File:Bilirubin.png" title="File:Bilirubin.png">Image:Bilirubin.png</a> by <a href="//commons.wikimedia.org/wiki/User:BorisTM" title="User:BorisTM">user:BorisTM</a>