Skeletal formula of <a href="https://en.wikipedia.org/wiki/cimetidine" class="extiw" title="w:cimetidine">cimetidine</a> (trade name <b>Tagamet</b>) — an <a href="https://en.wikipedia.org/wiki/Histamine_H2_receptor" class="extiw" title="w:Histamine H2 receptor">H<sub>2</sub> histamine receptor</a> antagonist.
<a href="//commons.wikimedia.org/w/index.php?title=User:Harbin&amp;action=edit&amp;redlink=1" class="new" title="User:Harbin (page does not exist)">Harbin</a>
<a rel="nofollow" class="external text" href="https://pubchem.ncbi.nlm.nih.gov/compound/2756">PubChem</a>