Pyranocoumarin (±)-4′-O-Acetyl-3′-O-angeloyl-cis-khellactone Induces Mitochondrial-Dependent Apoptosis in HL-60 Cells - Fong, Wang-Fun; Zhang, Jin-Xia; Wu, Jimmy Yiu-Cheong; Tse, Kai-Wing; Wang, Cheng; Cheung, Hong-Yeung; Yang, Meng-Su (Planta Medica, 2004)