Essential Moiety for Antimutagenic and Cytotoxic Activity of Hederagenin Monodesmosides and Bisdesmosides Isolated from the Stem Bark of Kalopanax pictus - Lee, Kyung-Tae; Sohn, Il-Cheol; Park, Hee-Juhn; Kim, Dong-Wook; Jung, Geun-Ok; Park, Kun-Young (Planta Medica, 2000)