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Chemical structures of epicatechin (EC), epigallocatechin (EGC), epicatechin-3-gallate (ECG) and epigallocatechin-3-gallate (EGCG). The green tea catechin structures are characterized by the dihydroxyl or trihydroxyl substitution on the B-ring and the m-5,7-dihydroxil substitutions on the A ring [5]. Created with ChemDraw®.
