Two phenethyl alcohol glycosides from Scutellaria orientalis subsp. Pinnatifida

Two new phenethyl alcohol glycosides, darendoside A and B (= deacyl martynoside) were isolated from the methanolic extract of the aerial parts of Scutellaria orientalis subsp. pinnatifida, along with four known glycosides, syringin, martynoside, leucosceptoside A and verbascoside. On the basis of chemical and spectral evidence the structures of darendoside A and B were determined as β-(4-hydroxyphenyl) ethyl O-β- d-apiofuranosyl-(1→ 2)- O-β- d-glucopyranoside and β-(3-hydroxy-4-methoxyphenyl)ethyl O-α- l-rhamnopyranosyl- (1→3)- O-β- d-glucopyranoside (=deacyl martynoside), respectively.