Skeletal formula of <a href="https://en.wikipedia.org/wiki/quinidine" class="extiw" title="w:quinidine">quinidine</a> — a class I <a href="https://en.wikipedia.org/wiki/antiarrhythmic_agent" class="extiw" title="w:antiarrhythmic agent">antiarrhythmic</a> and an <a href="https://en.wikipedia.org/wiki/antimalarial_medication" class="extiw" title="w:antimalarial medication">antimalarial medication</a>
<a href="//commons.wikimedia.org/wiki/User:Geralt_Riv" title="User:Geralt Riv">Geralt Riv</a>
<a rel="nofollow" class="external text" href="https://pubchem.ncbi.nlm.nih.gov/compound/441074">PubChem</a>