(+)-Spectaline, a Piperidine Alkaloid from &lt;i&gt;Senna spectabilis&lt;/i&gt; DC. Effective in Reducing the &lt;i&gt;In Vitro&lt;/i&gt; Infection of &lt;i&gt;Leishmania major&lt;/i&gt;
International journal of pharmacology, phytochemistry and ethnomedicine