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Properidine
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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Morrison AL, Rinderknecht H (1950). "302. Synthetic analgesics. Part V. Compounds related to pethidine". Journal of the Chemical Society (Resumed): 1467. doi:10.1039/JR9500001467. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Quotas - 2014". Diversion Control Division. U.S. Department of Justice, Drug Enforcement Administration. <a href="https://www.deadiversion.usdoj.gov/fed_regs/quotas/2014/fr0825.htm" target="_blank">https://www.deadiversion.usdoj.gov/fed_regs/quotas/2014/fr0825.htm</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>