Patent ID: 7842721

Claim:
A pharmaceutical composition having a cytotoxic effect to a cancer cell comprising: a flavonoid compound having at least one of the following formulas: wherein: B ring is a 4-oxo-cyclohexa-2,5-dienyl group, and any one of R 1 -R 12 is one selected from a group consisting of hydrogen group, hydroxyl group, C1-C20 alkyl group, C1-C20 ether group, C1-C20 ester group, carboxyl group, halogen and sugar; when R 2 of formula 1 is a hydroxyl group, R 4 of formula 1 is one selected from a group consisting of hydrogen group, C1-C20 alkyl group, C1-C20 ether group, C1-C20 ester group, carboxyl group, halogen and sugar; and when R 4 of formula 1 is a hydroxyl group, R 2 of formula 1 is one selected from a group consisting of hydrogen group, C1-C20 alkyl group, C1-C20 ether group, C1-C20 ester group, carboxyl group, halogen and sugar.