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HPLC chromatogram of hydrogels. The hydrogel contained dry ethanol extract of E. angustifolium (A); the hydrogel containing dry isopropanol extract of E. angustifolium (B); The hydrogel contained dry water extract of E. angustifolium (C), 1—gallic acid; 2–3,4 -hydroxybenzoic acid; 3–3-hydroxybenzoic acid; 4–4-hydroxybenzoic acid.
