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UPLC chromatogram obtained by supercritical CO2, 90% ethanol + 10% H2O (v/v) from a fix amount of cosolvent of 0.4 mL/min, at 25 MPa, 60 °C and an extraction time of 2 h: (A) standards; and (B) the extract of the bulb (1: peimisine (MW,427.3); 2: peimine (MW, 431.6); and 3: peiminine (MW, 429.6)).
