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In an attempt to find species specific markers, a phenoxychromone ( 1 ) and eight isoflavonoids including six isoflavans ( 2-7 ) and two isoflavanones ( 8  and  9 ) were isolated from the root of  Glycyrrhiza uralensis . Among the isolated phenolic compounds, glycyurelone ( 1 ), glycyurelvanins A and B ( 2  and  3 ) were found to be undescribed while others, (−)-vestitol ( 4 ), conferol A ( 5 ), glyasperin C ( 6 ), glyasperin D ( 7 ), (−)-licoisoflavanone ( 8 ), and (−)-3'-(γ,γ-dimethylallyl)kievitone ( 9 ) were previously reported. All compounds except  4  and  5  were prenylated and majority of these possess isoflavan scaffold with highly conserved stereo specificity at C-3 center. Structure elucidation was mainly based on extensive NMR, ECD and mass spectral data analysis.

Phenoxychromone and 4-hydroxyisoflavans from the roots of Glycyrrhiza uralensis