Diethyl Ether, Ether, C<sub>2</sub>H<sub>5</sub>OC<sub>2</sub>H<sub>5</sub>. Used in homeopathy as remedy: Aether / Aetherum (Aether)
<a href="//commons.wikimedia.org/wiki/User:Llez" title="User:Llez">H. Zell</a>
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<span class="int-own-work" lang="en">Own work</span>