ChEBI: Theasinensin A is a biflavonoid that is obtained by coupling of two molecules of (-)-epigallocatechin 3-gallate resulting in a bond between positions C-2 of the hydroxyphenyl ring. It is a natural product found in oolong tea. It has a role as an apoptosis inducer, an anti-inflammatory agent, a hypoglycemic agent, a hepatoprotective agent, an EC 3.2.1.20 (alpha-glucosidase) inhibitor, a melanin synthesis inhibitor, a plant metabolite and an anticoronaviral agent. It is a proanthocyanidin, a gallate ester and a biflavonoid. It is functionally related to a (-)-epigallocatechin 3-gallate.