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Flekhter, O.B., Nigmatullina, L.R., Baltina, L.A. et al. Synthesis of Betulinic Acid from Betulin Extract and Study of the Antiviral and Antiulcer Activity of Some Related Terpenoids. Pharmaceutical Chemistry Journal 36, 484–487 (2002). https://doi.org/10.1023/A:1021844705853
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DOI: https://doi.org/10.1023/A:1021844705853