Chemical studies of Chinese Licorice-roots 1. Elucidation of five new flavonoid constituents from the roots of Glycyrrhiza glaba L. collected in Xingjiang - Kitagawa,I.; Chen,W.; Hori,K.; Harada,E.; Yasuda,N.; Yoshikawa,M.; Ren,J. (Chemical and Pharmaceutical Bulletin, 1994)