Isolation of highly polar galloyl glucoside tautomers from Saxifraga tangutica through preparative chromatography and assessment of their in vitro antioxidant activity.

Among them, the protective effect of 2- O -galloyl-α- d -glucose ⇌ 2- O -galloyl-β- d -glucose (Fr2-1-2/Fr2-1-3) on oxidative stress injury in HepG2 cells was extremely significant ( P < 0.01).

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