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HPLC chromatograms of VtR and chemical structure of (+)-vitisin A (1), (−)-vitisin B (2), and ampelopsin C (3). Retention times for internal standard (4-hydroxy-3-methoxycinnamaldehyde, IS), ampelopsin C (3), (+)-vitisin A (1), and (−)-vitisin B (2) were 15.0, 21.1, 25.7, and 29.7 min, respectively. The traced component of peak 4 with a retention time of 17.9 min was resveratrol.
