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      A new biflavonoid and a new triterpene from the leaves of Garcinia paucinervis and their biological activities.

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          Abstract

          A new biflavonoid, paucinervin K (1) and a new triterpene, 23-hydroxy-friedelin (2), together with eleven known compounds 3-13 were isolated from the leaves of Garcinia paucinervis. Their structures, including stereochemistry, were determined by spectroscopic analysis of NMR, MS, IR and ECD calculation and the octant rule. Some of the isolated compounds were tested for antiproliferative, α-glucosidase inhibitory and antioxidant activities in vitro. Compounds 1, 3, 4, 5 and 9 showed moderate preferential antioxidant and hypoglycemic activities. Compounds 3-6 and 9 exhibited potent growth inhibition against HepG-2 and PC-3 cell lines with IC50 values ranging from 1.02-10.05 μM.

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          Affiliations
          [1 ] Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang, 110016, People's Republic of China.
          [2 ] School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, Liaoning, People's Republic of China.
          [3 ] Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang, 110016, People's Republic of China. lzl1030@hotmail.com.
          [4 ] School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, Liaoning, People's Republic of China. lzl1030@hotmail.com.
          [5 ] Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang, 110016, People's Republic of China. huimhua@163.com.
          [6 ] School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, Liaoning, People's Republic of China. huimhua@163.com.
          Journal
          J Nat Med
          Journal of natural medicines
          Springer Nature
          1861-0293
          1340-3443
          May 26 2017
          28550652 10.1007/s11418-017-1092-7 10.1007/s11418-017-1092-7

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