Hydrolyzable tannins having a depsidone-forming valoneoyl group

Tsutomu Hatano, Osamu Namba, Ling Chen, Taeko Yasuhara, Kazufumi Yazaki, Takashi Yoshida, Takuo Okuda

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Prostratin C (1) isolated from Euphorbia prostrata, and praecoxins C (2) and D (3) isolated from Stachyurus praecox, were found to be hydrolyzable tannins having a depsidone-forming valoneoyl group as a constituent unit. The orientation of the valoneoyl group in praecoxins C and D as in the structures 2 and 3 was unequivocally proved by the 1H-13C long-range shift correlation spectrum of rugosin C (5) which was chemically correlated with praecoxin C.

Original languageEnglish
Pages (from-to)1221-1224
Number of pages4
Issue number7
Publication statusPublished - Jul 1 1990

ASJC Scopus subject areas

  • Analytical Chemistry
  • Pharmacology
  • Organic Chemistry


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