Cowaniin, a C-glucosidic ellagitannin dimer linked through catechin from Cowania mexicana

Hideyuki Ito, Masateru Miyake, Eisei Nishitani, Kyoko Miyashita, Morio Yoshimura, Takashi Yoshida, Midori Takasaki, Takao Konoshima, Mutsuo Kozuka, Tsutomu Hatano

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


A new complex tannin, cowaniin (1) was isolated from the leaves and stems of Cowania mexicana (Rosaceae), and its structure was characterized as novel C-glucosidic tannin dimer linked through (+)-catechin on the basis of spectral and chemical evidence. The inhibitory effect on activation of the Epstein-Barr virus early antigen was assessed for cowaniin. Six known polyphenols and related compounds, including a nitrile glucoside, purshianin, were also characterized.

Original languageEnglish
Pages (from-to)492-494
Number of pages3
JournalChemical and Pharmaceutical Bulletin
Issue number3
Publication statusPublished - Mar 2007
Externally publishedYes


  • C-glucosidic ellagitannin dimer
  • Complex tannin
  • Cowania mexicana
  • Cowaniin
  • Epstein-Barr virus
  • Rosaceae

ASJC Scopus subject areas

  • General Chemistry
  • Drug Discovery


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