Hypericin, also known as quercetin-3-o- β- D-galactopyranoside. It belongs to flavonol glycosides and is an organic compound with the chemical formula of c21h20o12. It is soluble in ethanol, methanol, acetone and pyridine and stable under normal conditions. The aglycone is quercetin and the sugar group is galactopyranose, which is formed by the O atom at position 3 of quercetin β Glycosidic bonds are linked to sugar groups. Hypericin is widely distributed. It is an important natural product with a variety of physiological activities, such as anti-inflammatory, antispasmodic, diuretic, cough relieving, blood pressure reducing, cholesterol lowering, protein assimilation, local and central analgesia, and protective effects on heart and cerebral vessels.