numbering of <a href="//commons.wikimedia.org/wiki/File:Camptothecin.svg" title="File:Camptothecin.svg">Camptothecin</a>
<a href="//commons.wikimedia.org/wiki/User:Yikrazuul" title="User:Yikrazuul">Yikrazuul</a>
<span class="int-own-work" lang="en">Own work</span>