New ellagitannin and galloyl esters of phenolic glycosides from sapwood of Quercus mongolica var. crispula (Japanese oak)

- Polyphenols in sapwood of Quercus mongolica var. crispula were investigated.
- A new oxidation metabolite of vescalagin was isolated.
- New galloyl esters of a phenol glycoside and a lignan glycoside were obtained.
- The structures were determined chemical and spectroscopic methods.
- Nineteen known compounds were identified.