One of the tannic acids (C15H14O6), extracted from catechu as a white, crystalline substance; -- called also catechuic acid, catechinic acid, cyanidol, and catechuin. It is a flavonoid found generally in higher woody plants, and is used in dyeing and tanning.
A smaller, simple flavanol that is found in red wine, tea and in abundant quantities in cocoa beans, which may have potential heart health benefits.