Novel epigallocatechin gallate tetramer and vascular endothelial function improving agent containing them

摘要

Providing a compound capable of continuously taking and having a vascular endothelial function improving effect by enhancing NO function from the vascular endothelial cells. A compound represented by Formula (I) wherein R 1 , R 2 , R 3 and R 4 are each independently H or a gallate group, a vascular endothelial function improving agent, food and drink or pharmaceutical composition containing the compound.