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The typical reference chromatogram (top) and the typical chromatogram of red wine (bottom). gallic acid (1), coumalic acid (2), protocatechuic acid (3), proanthocyanidin B1 (4), catechins (5), caffeic acid (6), syringic acid (7), epicatechin (8), p-coumaric acid (9), isoquercitrin (10), isorhamnetin 3-O-glucoside (11) and quercetin (12).
