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HPLC chromatogram of kayeassamin I (1a, 1b). HPLC condition: column, Cosmosil 5C18-MS-II (250 × 4.6 mm, i.d.); detection, UV (254 nm); mobile phase, CH3CN−1% aqueous AcOH (90:10, v/v); flow rate, 1.0 mL/min; column temperature, r.t. (25°C).
