2D skeletal formula of <a href="https://en.wikipedia.org/wiki/Etridiazole" class="extiw" title="en:Etridiazole">en:Etridiazole</a>.
<a href="//commons.wikimedia.org/wiki/User:ChemLlama" title="User:ChemLlama">ChemLlama</a>
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<span class="int-own-work" lang="en">Own work</span>