A New Guaianolide as Apoptosis Inhibitor from Chrysanthemum boreale - Lee, Jong Rok; Yang, Min Suk; Jang, Dae Sik; Ha, Tae Joung; Park, Ki Min; Lee, Choong-Hwan; Kho, Yung-Hee; Park, Ki Hun (Planta Medica, 2001)