<i>N</i>-(3-chloro-2-hydroxypropyl)-<i>N</i>,<i>N</i>,<i>N</i>-trimethyl ammonium chlorid, CHPTAC
<a href="//commons.wikimedia.org/wiki/User:Sponk" title="User:Sponk">Sponk</a>
<span class="int-own-work" lang="en">Own work</span>