Chemical structure of <a href="https://en.wikipedia.org/wiki/Brooker%27s_merocyanine" class="extiw" title="w:Brooker's merocyanine">Brooker's merocyanine</a>
<a href="//commons.wikimedia.org/wiki/User:Xplus1" title="User:Xplus1">Xplus1</a>
<span class="int-own-work" lang="en">Own work</span>