Structure of <a href="https://en.wikipedia.org/wiki/5-aza-7-deazaguanine" class="extiw" title="w:5-aza-7-deazaguanine">5-aza-7-deazaguanine</a>
<a href="//commons.wikimedia.org/wiki/User:Leyo" title="User:Leyo">Leyo</a>
<span class="int-own-work" lang="en">Own work</span>