Studies on alismatis rhizoma. III. Stereostructures of new protostane-type triterpenes, alisols H, I, J-23-acetate, K-23-acetate, L-23-acetate, and N-23-acetate, from the dried rhizome of Alisma orientale - Yoshikawa,M.; Tomohiro,N.; Murakami,T.; Ikebata,A.; Matsuda,H.; Matsuda,H. (Chem Pharm Bull, 1999)