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(a) HPLC analysis of the crude sample of E. yunnanensis. (a); (b) HPLC chromatograms spectra of MIAs (1–6). Conditions: YMC-Triart C18 (150 × 9.6 mm, i.d., 5 μ); flow rate, 1.0 mL/min; UV wavelength, 254 nm; solvent A (acetonitrile) and B (0.3% v/v aqueous acetic acid) in gradient elution as follows: 0–8 min, 42% A; 8–32 min, 42% A–50% A; 32–35 min, 50% A.
