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This paper concerns the study of the roots and rhizomes of Glycyrrhiza uralensis where one new alkaloid glycoside, 3,4-dihydroxyquinoline 4- O-β-d-glucopyranoside, along with 13 known compounds (12 phenolic glycosides and one triterpene glycoside) were isolated and identified. The structure of the new compound and the known ones were identified on the basis of nuclear magnetic resonance (NMR) and mass spectrometric (MS) analysis. All the glycosides were tested for their anti-neuroinflammatory activities by inhibiting nitric oxide (NO) release in lipopolysaccharide (LPS)-induced murine microglial BV-2 cells. Several compounds were tested for their antioxidant activities in rat adrenal pheochromocytoma PC12 cells. A structure–activity relationship (SAR) analysis was carried out and revealed that the position and amount of sugar moieties have significant impact on antioxidant activities.

Glycoside Compounds From Glycyrrhiza uralensis and Their Neuroprotective Activities