C-Glycosidic Ellagitannins and Their Influence on Wine Chemistry - Chemistry and Biology of Ellagitannins - page 323

thanks to the outstanding efforts of Japanese researchers, in particular
from the Okayama, Kyushu and Nagazaki schools, during their more
than thirty-year (still going on) systematic search of active principles in
plant species used in oriental medicines.
Fig. 9.2 Together with vescalagin and castalagin (see Fig. 9.1), these compounds are the
major NHTP-bearing C -glycosidic ellagitannins found in fagaceous hardwood species.