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High-performance liquid chromatography (HPLC) fingerprint of Uncaria rhynchophylla. The peaks at Rt 17.5 to 25.5 min can be assigned to isocorynoxeine (5), rhynchophylline (7), corynoxeine (8), isorhynchophylline (9), hirsuteine (12), and hirsutine (13).
