A pair of epimeric lignan glycosides from Selaginella tamariscina.

To explore the chemical constituents of Selaginella tamariscina and their effects on cancer cells, this study employed multiple chromatographic techniques including polyamide, silica gel, and semi-preparative High-performance liquid chromatography for compound isolation. The structures of the compounds were elucidated based on physicochemical properties and spectroscopic data. A pair of epimeric lignan glycosides, 7'R-tamariscinol U 4-O-β-d-glucopyranoside (1), 7'S-tamariscinol U 4-O-β-d-glucopyranoside (2) were obtained, along with two known compounds 3,5,7-trimethoxyflavone-4'-O-β-d-glucopyranoside (3) and selapeptin B (4). 1 and 2 are new, while the spectral data of 3 and 4 in methanol-d4 are reported for the first time.