Abstract
A new lignan glycoside, 7α, 7′β-bis-(4-hydroxy-3-methoxyphenyl)-7,9′:7′,9-diepoxylignan-8αH,8′α-O-β-d-(2″,7′α-epoxy)-glucopyranoside, named elshrugulosain (1), has been isolated from the EtOH extract of Elsholtzia rugulosa, together with six known compounds, ( − )-bornyl (E)-3,4,5-trimethoxycinnamate, apigenin, luteolin, apigenin-7-O-β-d-glucopyranoside, luteolin-7-O-β-d-glucopyranoside, and luteolin-3′-glucuronate methyl ester. Their structures were characterized by spectroscopic methods and comparison with the data in the literature. On the basis of detailed 1D and 2D NMR spectral analysis, as well as X-ray crystallographic diffraction, the NMR spectroscopic data of ( − )-bornyl (E)-3,4,5-trimethoxycinnamate were revised and assigned completely.
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