structure of Carfentanyl
<a href="//commons.wikimedia.org/wiki/User:Ilgom" title="User:Ilgom">Ilgom</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Ilgom" title="User talk:Ilgom">talk</a>)
<span class="int-own-work" lang="en">Own work</span>