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Structural formula of the biosynthesized tea polyphenols. Five biosynthesized compounds, (+)-catechin, (−)-epicatechin, (−)-epigallocatechin, (−)-epicatechin gallate, and (−)-epigallocatechin gallate, were evaluated. (−)-Epigallocatechin is produced by hydroxylation of (−)-epicatechin. (−)-Epicatechin gallate and (−)-epigallocatechin gallate are synthesized by esterification with gallic acid.
