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Mesembrenone is an alkaloid constituent of Sceletium tortuosum (Kanna). Similar to modern synthetic antidepressants, it is a potent (IC50 < 1 μM) selective inhibitor of the serotonin transporter (SERT) (that is, a selective serotonin reuptake inhibitor; Ki = 27 nM) and also a phosphodiesterase 4 (PDE4) inhibitor (Ki = 470 nM).
References
Mesembrenone Wikipedia(Text) CC BY-SA