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Characteristic chromatograms of ETA and the markers assayed by HPLC. (A) ETA; 1–19, detectable components; (B) the mixed markers, 1–4, marker compounds 1–4. For assay, methanol solutions of mixed markers 1–4 (1.04, 1.21, 0.98, 0.96 mg/mL) and of ETA (1.42 mg/mL) were used, oven temperature was set at 30 °C, and detecting wavelength was set at 230 nm.
