LSD-Pip
<p><b>LSD-Pip</b> is a compound from the <a href="http://en.wikipedia.org/wiki/Ergoline" title="Ergoline">ergoline</a> family, related to <a href="http://en.wikipedia.org/wiki/LSD" title="LSD" class="mw-redirect">LSD</a> but with the <i>N,N</i>-diethyl substitution replaced by a <a href="http://en.wikipedia.org/wiki/Piperidine" title="Piperidine">piperidine</a> group. It is more potent than the corresponding pyrrolidine and morpholine analogues (<a href="http://en.wikipedia.org/wiki/LPD-824" title="LPD-824">LPD-824</a> and <a href="http://en.wikipedia.org/wiki/LSM-775" title="LSM-775">LSM-775</a> respectively), but is still several times less potent than LSD as a <a href="http://en.wikipedia.org/wiki/5-HT2A_receptor" title="5-HT2A receptor">5-HT<sub>2A</sub></a> <a href="http://en.wikipedia.org/wiki/Agonist" title="Agonist">agonist</a>.<sup id="cite_ref-1" class="reference"><a href="http://en.wikipedia.org/wiki/LSD-Pip#cite_note-1">[1]</a></sup> Early studies suggested this compound to be inactive as a <a href="http://en.wikipedia.org/wiki/Psychedelic_drug" title="Psychedelic drug">psychedelic</a> in humans,<sup id="cite_ref-pmid13502837_2-0" class="reference"><a href="http://en.wikipedia.org/wiki/LSD-Pip#cite_note-pmid13502837-2">[2]</a></sup> though this does not seem to have been confirmed by any more recent work.</p>