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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
HPLC analysis of the PCRR extracts. The characteristic peaks of three standards, and the peaks obtained for PCRRwater and PCRREtOH, were detected at an absorbance of 306 nm. The three peaks are (1) polydatin, (2) gallic acid, and (3) resveratrol.