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HPLC chromatograms of sample solution and standards. Lophatherum gracile (LG, No. 2) leaf-extracts (A), Pleioblastus amarus (PA, No. 8) leaf-extracts (B), Phyllostachys nigra (PN, No. 21) leaf-extracts (C), and seven mixed reference standards (a, b, c, d, e, f, g) (D).
