Abstract
A new 2-carboxy-dihydrostilbene glucoside, 2-carboxy-3,5,4′-trihydroxydihydrostilbene 3-O-β-d-glucopyranoside (1) and a new flavan diglycoside, (2S)-5,7,4′-trihydroxyflavan 7-O-β-d-apiofuranosyl-(1→6)-O-β-d-glucopyranoside (3) were isolated from the aerial portion of Thai origin Desmodium heterocarpon together with five known compounds, lunularic acid 4′-O-β-d-glucopyranoside (2), vitexin (4), isovitexin (5), (−)-epi-catechin 3-O-β-d-glucopyranoside (6), and (−)-epi-afzelachin 3-O-β-d-glucopyranoside (7). The structure determinations were based on physical data and spectroscopic evidence including 1D- and 2D-NMR experiments. The presence of 2-carboxy-dihydrostilbene derivatives from this species added the information data of this compound-type to the plant kingdom.
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