Pyranocoumarin (±)-4′-O-acetyl-3′-O-angeloyl-cis-khellactone induces mitochondrial-dependent apoptosis in HL-60 cells - Fong, W F; Zhang, J X; Wu, J Y; Tse, K W; Wang, C; Cheung, H Y; Yang, M S (Planta Med, 2004)