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Analytical HPLC chromatogram of reference substances (A) and phenolic compounds of leaf extracts of P. fruticosa , P. glabra and P. parvifolia (B): peak 4, (+)-catechin; peak 7, caffeic acid; peak 10, ferulic acid; peak 13, hyperoside; peak 14, rutin; peak 16, ellagic acid.
