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The HPLC analysis of green tea extracts catechins (A) and chemical structures of catechins (B). C, catechin; EC, epicatechin; GC, gallocatechin; CG, catechin gallate; EGC, epigallocatechin; CAF, caffeine; ECG, epicatechin gallate; EGCG, epigallocatechin gallate.
