Abstract
Two new compounds including a new 3-arylcoumarin liquiritcoumarin (1), and a new flavonoid glycoside crotoliquiritin (2), together with twelve known compounds (3–14) were isolated from the radix and rhizome of Glycyrrhiza uralensis. Their structures were elucidated on the basis of extensive spectroscopic data analyses. All of the compounds were evaluated for the cytotoxic activities. Only compound 5 showed moderate effects with IC50 of 11.46 μM for A549 cells and IC50 of 7.38 μM for NCI-H292 cells. Compounds 1 and 2 were demonstrated to be Nrf2 pathway activators by using a stable antioxidant response element (ARE)-dependent reporter gene assay together with immunoblot and immunofluorescence analysis.
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