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Synthesis and Cytotoxic Activity of New Betulin and Betulinic Acid Esters with Conjugated Linoleic Acid (CLA)Tubek, Barbara; Mituła, Paweł; Niezgoda, Natalia; Kempińska, Katarzyna; Wietrzyk, Joanna; Wawrzeńczyk, Czesław · Natural Product Communications · 2013