Author's Organization:Faculty of Pharmaceutical Sciences, Higashi Nippon Gakuen University Faculty of Pharmaceutical Sciences, Okayama University Faculty of Pharmaceutical Sciences, Higashi Nippon Gakuen University Faculty of Pharmaceutical Sciences, Okayama University
A rosmarinic acid dimer named rabdosiin (1__-) was isolated from the stem of (Rabdosia japonica)___- Hara (Labiatae). Its structure was determined including the absolute configurations at four asymmetric centers.