Studies on chemical constituents of the leaves of Smallantus sonchifolius (yacon): Structures of two new diterpenes

De-Qiang Dou, Fang Tian, Ying-Kun Qiu, Zheng Xiang, Bi Xia Xu, Ting Guo Kang and Feng Dong

Natural Product Research Part A 24 ( 1 ): 40 - 47 , 2010