(-)-catechin-3-O-gallate is a gallate ester obtained by formal condensation of the carboxy group of gallic acid with the (3R)-hydroxy group of (-)-catechin. It has a role as a metabolite. It is a gallate ester, a polyphenol and a member of flavans. It derives from a (-)-catechin and a gallic acid. It is an enantiomer of a (+)-catechin-3-O-gallate.