Tautomerism of <a href="https://en.wikipedia.org/wiki/Kopexil" class="extiw" title="en:Kopexil">kopexil</a> (2,3-dihydro-3-hydroxy-2-imino-4-pyrimidinamine)
<a href="//commons.wikimedia.org/wiki/User:Leyo" title="User:Leyo">Leyo</a>
2011-03
<span class="int-own-work" lang="en">Own work</span>