Fig. (2) Percentage of ACEI activity of khellin (0.73 mM, 192.3 µg/mL) and khellol (0.78 mM, 192.3 µg/mL) (values = means ± SD, n= 4). Galanthamine (0.1 mM, 38.46 µg/mL), used as a positive control, showed 93.4% inhibitory activity.