Stachysetin, a diapigenin-7-glucoside-p,p′-dihydroxy-truxinate from Stachys aegyptiaca
摘要:
Aerial parts of Stachys aegyptiaca contain the unique acylated flavonoid, diapigenin-7-O-(6''-trans,6''-cis-p,p'-dihydroxy-mu-truxinyl)glucoside, stachysetin, and the hitherto unknown, apigenin 7-O-(3''-p-coumaryl)glucoside. In addition, the known compounds, apigenin 7-O-(6''-p-coumaryl)glucoside and naringenin were also identified. Structures were established by conventional methods of analysis and confirmed by H-1, C-13 NMR and mass spectral analysis. 2D-chemical shift correlation NMR was also used in the case of the new flavonoids.