(-) -Epigallocatechin Gallate CAS NO. 989-51-5 is white crystal, soluble in organic solvents such as DMSO, derived from tea. (-) -Epigallocatechin Gallate CAS NO. 989-51-5 is the most effective active ingredient in catechins, accounting for about 8% to 13% of the gross weight of green tea, and (-) -Epigallocatechin Gallate CAS NO. 989-51-5 is also the component with the highest content in catechins. (-) -Epigallocatechin Gallate CAS NO. 989-51-5The ester formed by benzopyran with gallic acid has phenolic antioxidant properties, and (-) -Epigallocatechin Gallate CAS NO. 989-51-5 molecular structure has six adjacent phenolic hydroxyl groups, thus having many properties superior to other catechins.