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Zhu P, Bi Y, Xu J, Li Z, Liu J, Zhang L, Ye W, Wu X. Terpenoids. III: Synthesis and biological evaluation of 23-hydroxybetulinic acid derivatives as novel inhibitors of glycogen phosphorylase. Bioorganic & Medicinal Chemistry Letters. 2009 Dec;19(24):6966–9. doi: 10.1016/j.bmcl.2009.10.055. |