phenylethanoid glucoside, 2-(3,4-dihydroxyphenyl)-ethyl- O -β- d -glucopyranosyl-(1→6)-3- O - trans -caffeoyl-β- d -glucopyranoside, named isolugrandoside, was isolated from Fraxinus ornus bark, together with the five known phenylethanoid glycosides 2-(4-hydroxyphenyl)-ethyl-(6- O -caffeoyl)-β- d -glucopyranoside, calceolarioside B, verbascoside, isoacteoside and lugrandoside. Isomerization of lugrandoside