Tertiary amine.
<a href="//commons.wikimedia.org/wiki/User:KES47" class="mw-redirect" title="User:KES47">Kes<sup>4</sup><sub>7</sub></a>
Own work based on: <a href="//commons.wikimedia.org/wiki/File:Amine-2D-general.png" title="File:Amine-2D-general.png">Amine-2D-general.png</a>