Cytotoxic Triterpenoids and Steroids from the Bark of Melia azedarach - Wu, Shi-Biao; Bao, Qiu-Ying; Wang, Wen-Xuan; Zhao, Yun; Xia, Gang; Zhao, Zheng; Zeng, Huaqiang; Hu, Jin-Feng (Planta Medica, 2011)