Author's Organization:/ Showa College of Pharmaceutical Sciences Research Laboratory of Biological Science, Kodama Ltd. Showa College of Pharmaceutical Sciences Research Laboratory of Biological Science, Kodama Ltd. Research Laboratory of Biological Science, Kodama Ltd.
It was found that the eremophilenolides (1) and (2), the constituents of the rhizomes of Petasites japonicus Maxim., have moderate anti-histaminic and anti-allergic activities.