Skeletal formula of <a href="https://en.wikipedia.org/wiki/clemizole" class="extiw" title="w:clemizole">clemizole</a> — a <a href="https://en.wikipedia.org/wiki/benzimidazole" class="extiw" title="w:benzimidazole">benzimidazole</a> <a href="https://en.wikipedia.org/wiki/H1_antagonist" class="extiw" title="w:H1 antagonist">H<sub>1</sub> antagonist</a>. Created with <a rel="nofollow" class="external text" href="http://www.chemdoodle.com">ChemDoodle 8.1.0</a> and <a rel="nofollow" class="external text" href="http://www.adobe.com/products/illustrator.html">Adobe Illustrator CC 2015</a>.
<a href="//commons.wikimedia.org/wiki/User:Vaccinationist" title="User:Vaccinationist">Vaccinationist</a>
Own work  using: <a rel="nofollow" class="external text" href="https://pubchem.ncbi.nlm.nih.gov//compound/2782">PubChem</a>