chemical structure 7-Oxa-1,5-diaza-8-mercura-bicyclo[4.2.0]octan
<a href="//commons.wikimedia.org/wiki/User:NadirSH" class="mw-redirect" title="User:NadirSH">NadirSH</a>
2019-03-19
<span class="int-own-work" lang="en">Own work</span>