Lignan, phenylpropanoid and iridoid glycosides from Pedicularis torta

Six new lignan glucosides, tortosides A-F were isolated from whole plants of Pedicularis torta, along with 11 known compounds, (+)dihydrodehydrodiconiferyl alcohol-4-O-α-l-rhamnopyranoside, (+)-dihydrodehydrodiconiferyl alcohol-4-O-β-d-glucopyranoside, (+)-dihydrodehydrodiconiferyl alcohol-9-O-β-d-glucopyranoside, (+)-dehydrodiconiferyl alcohol-4-O-β-d-glucopyranoside, cistanosides C and D, verbascoside, 8-epiloganin, gardoside methyl ester, shanzhiside methyl ester and loganic acid. On the basis of spectral and chemical evidence, tortosides A-F were determined to be epi-syringaresinol-4″-O-β-d-glucopyranoside, 5,5′-dimethoxylariciresinol-4′-O-β-d-glucopyranoside, 5′,5″-demethylsyringaresinol-4″-O-β-d-glucopyranoside, (+)-dehydrodiconiferyl alcohol-9-O-β-d-4″-O-methylglucopyranoside, (+)-5-methoxydihydrodehydrodiconiferyl alcohol-9′-O-β-d-glucopyranoside and (+)-dehydroconiferyl alcohol-8,5′-dehydroconiferyl aldehyde-9-O-β-d-glucopyranoside, respectively.