Author's Organization:Faculty of Pharmaceutical Sciences, Okayama University Faculty of Pharmaceutical Sciences, Okayama University Faculty of Pharmaceutical Sciences, Okayama University Faculty of Pharmaceutical Sciences, Okayama University
New hydrolyzable tannins, rugosin A (1), B (2), C (3) from Rosa rugosa, and 3 and praecoxin A (7) from Stachyurus praecox, were isolated, and their structures, including the valoneoyl group, were elucidated.