Kou Wang, Xiao-Yu Zhou, Yuan-Yuan Wang, Ming-Ming Li, Yin-Shan Li, Li-Yan Peng, Xiao Cheng, Yan Li, Yi-Ping Wang*, Qin-Shi Zhao*. Macrophyllionium and Macrophyllines A and B, Oxindole Alkaloids fromUncaria macrophylla.J Nat Prod2011; 74:12–15