Diterpene Glycosides from Egletes viscosa - Lee, Dongho; Li, Chen; Graf, Tyler N; Vigo, Jose Schunke; Graham, James G; Cabieses, Fernando; Farnsworth, Norman R; Cordell, Geoffrey A; Kinghorn, A Douglas; Kroll, David J; Wani, Mansukh C; Oberlies, Nicholas H (Planta Medica, 2005)