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HPLC chromatogram of QSKL at 254 nm. 1: chlorogenic acid; 2: cryptochlorogenic acid; 3: neochlorogenic acid; 4: secologanic acid; 5: sweroside; 6: Secoxyloganin; 7: liquiritin; 8: isochlorogenic acid A; 9: isochlorogenic acid C; 10: ononin; 11: salvianolic acid B; 12: calycosin; 13: harpagoside; 14: formononetin; 15: glycyrrhizic acid.
