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. 2014 May 14;6(1):99–104. doi: 10.1016/j.jare.2014.05.001

Fig. 2.

Fig. 2

Identification of β-glycyrrhizin in G. uralensis crude extract by comparison with the 2D ROESY spectra of α- and β-glycyrrhetic acid. Expansions of 2D ROESY spectra for α-glycyrrhetic acid (A), β-glycyrrhetic acid (B), and G. uralensis extract (C) showing correlations through space between H-18 and CH3-28 in the β-isomers but H-18 and CH3-27 as well as CH3-29 in the α-isomer; arrows point to correlations.