Highlights
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Two new and two known flavonoid glycosides were isolated from Iris tectorum.
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The linkage pattern of the rhamnose substituent at C-5 was not common in naturally occurring flavonoid glycosides.
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Their structures were elucidated by spectroscopic analysis and chemical evidence.
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All isolates were evaluated for their inhibitory activity against aldose reductase.
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Compound 1 showed moderate inhibitory activity, with IC50 values of 1.63 μM.