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High-performance liquid chromatography chromatogram and the chemical structure of 4 markers of ethanol extracts of Lycopus lucidus Turcz. ex Benth (ELT). (1) Protocatechuic acid, (2) caffeic acid, (3) rutin, and (4) rosmarinic acid. The markers were identified at wavelengths (a) 254 nm and (b) 330 nm using HPLC and diode array UV/VIS detector. (c) Chemical structure of four markers of ELT.
