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Mesembrenone is an alkaloid that has been found in S. tortuosum and has anticancer activity.1,2 It is selectively cytotoxic to MOLT-4 acute lymphoblastic leukemia (ALL) cells over LMTK alveolar fibroblasts (EC50s = 0.6 and 10 µg/ml, respectively).2
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1. Mesembrine alkaloids: Review of their occurrence, chemistry, and pharmacology. J. Ethnopharmacol. 195, 10-19 (2017).
2. Cytotoxic activity of amaryllidaceae alkaloids. Planta Med. 61(1), 77-79 (1995).