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Drag-Zalesinska M, Kulbacka J, Saczko J, Wysocka T, Zabel M, Surowiak P, Drag M. Esters of betulin and betulinic acid with amino acids have improved water solubility and are selectively cytotoxic toward cancer cells. Bioorganic & Medicinal Chemistry Letters. 2009 Aug;19(16):4814–7. doi: 10.1016/j.bmcl.2009.06.046. |