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Chemical constituents of Nepalese propolis: isolation of new dalbergiones and related compounds

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Abstract

Two new dalbergiones (1–2) and a new flavanone (3) were isolated along with nine other known flavonoids (4–12) from the methanolic extract of propolis collected from Chitwan, Nepal. The structures were determined on the basis of spectral analysis.

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Acknowledgements

The authors are grateful to Ms. J. Hada for providing NMR and MS data and Mr. Khem Raj Neupane (Gorkha Bee Farm) for providing propolis.

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Authors and Affiliations

  1. Kyoritsu University of Pharmacy, 1-5-30 Shibakoen, Minato-ku, Tokyo, 105-8512, Japan

    Suraj Prakash Shrestha, Yuji Narukawa & Tadahiro Takeda

Authors
  1. Suraj Prakash Shrestha
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  2. Yuji Narukawa
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  3. Tadahiro Takeda
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Correspondence to Tadahiro Takeda.

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Shrestha, S.P., Narukawa, Y. & Takeda, T. Chemical constituents of Nepalese propolis: isolation of new dalbergiones and related compounds. J Nat Med 61, 73–76 (2007). https://doi.org/10.1007/s11418-006-0024-8

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  • DOI: https://doi.org/10.1007/s11418-006-0024-8

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