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This article is about larger phenolic substances. The term polyphenol appears to have been in use since 1894. 14 gallic acid units around a core of three units of glucose, with two gallic acids as simple esters, and the remaining 12 appearing in 6 ellagic acid-type units. Ester, ether, and biaryl linkages are present, see below. This definition departs from the WBSSH definition in terms of physicochemical behavior, with its lack of reference to solubility, precipitation, and complexation phenomena. WBSSH definition, but is by the Quideau definition. 40 phenolic hydroxyl groups, meets the criteria of both definitions of a polyphenol.