New tetracyclic triterpenoids from Jatropha gossypiifolia induce cell-cycle arrest and apoptosis in RKO cells. - Zhang, Chun-Yan; Pan, Rong-Rong; Zhang, Xiao-Dan; Zhou, Ying; Ye, Ying; Xia, Jing; Rahman, Khalid; Zhang, Hong; Zhu, Jian-Yong (Fitoterapia, 2018)