Study on the chemical constituents of gynostemma pentaphyllum(thurb) makino. I. Study on a new type of dammarane sapogenin: Elucidation of the structure of Gynogenin II
WEI JUNXIAN;CHEN YEGAO;XU XINGLUN;FANG HONGLIANG;CHEN GUOCAI;MACKAY,M.F.
Acta Chimica Sinica . 1991, (9): 932 -936 .