5-Alkylresorcinol glucosides from the leaves of Grevillea robusta Allan Cunningham.

From the 1-BuOH-soluble fraction of a MeOH extract of the leaves of Grevillea robusta Allan Cunningham, two 5-alkylresorcinol glucosides, named grevillosides G and H (1, 2), and grevilloside E methyl ester (3) were isolated, along with one known megastigmane glucoside, staphylionoside D (4). The structures of the new compounds were elucidated by means of spectroscopic analyses. The structure of the related phenolic glucoside (1a) isolated from Veronica thymoides subsp. pseudocinerea was reported to be the same as that of 1. However, as judged on the close inspection of the spectroscopic data, its structure (1a) must be revised to 3,4-dihydroxyphenylethanol 3-O-glucoside.