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High-performance liquid chromatography (HPLC) fingerprint of rhizome (a), stem (b), leaf (c) and fingerprints after variable transformation (d–f). (1) loganin, (2) 6′-O-β-d-glucopyranosylgentiopicroside, (3) swertiamarine, (4) gentiopicroside, and (5) sweroside.
