5,6-benzoflavone having multidrug resistance inhibitory activity, a method for preparing the same and a pharmaceutical composition comprising the same

PURPOSE: A 5,6-benzoflavone compound with multidrug resistance inhibitory activity and a composition containing the same for multidrug resistance inhibition are provided to develop a health foods. CONSTITUTION: A pharmaceutical composition for multidrug resistance inhibition contains 5,6-benzoflavone compound of chemical formula 1 or pharmaceutically acceptable salt thereof as an active ingredient. The pharmaceutical composition is used in the form of a tablet, capsule, pill, or liquid. A multidrug resistance inhibitor contains the compound of chemical formula 1 or pharmaceutically acceptable salt thereof as an active ingredient and is used as a NF-kappaB inhibitor. A health food for multidrug resistance inhibition contains the compound of chemical formula 1 and sitologically acceptable food additive as an active ingredient. The health food is formed in a tablet, capsule, pill, or beverage.