Lignan, phenylpropanoid and iridoid glycosides from Pedicularis torta

Six new lignan glucosides, tortosides A-F were isolated from whole plants of Pedicularis terra, along with 11 known compounds, (+)dihydrodehydrodiconiferyl alcohol-4-O-alpha-L-rhamnopyranoside, (+)-dihydrodehydrodiconiferyl alcohol-4-O-beta-D-glucopyranoside, (+)-dihydrodehydrodiconiferyl alcohol-9-O-beta-D-glucopyranoside, (+)-dehydrodiconiferyl alcohol-4-O-beta-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-beta-D-glucopyranoside, 5,5'-dimethoxylariciresinol-4'-O-beta-D-glucopyranoside, 5',5 ''-demethylsyringaresinol-4 ''-O-beta-D-glucopyranoside, (+)-dehydrodiconiferyl alcohol-9-O-beta-D-4 ''-O-methylglucopyranoside, (+)-5-methoxy-dihydrodehydrodiconiferyl alcohol-9'-O-beta-D-glucopyranoside and (+)-dehydroconiferyl alcohol-8,5'-dehydro-coniferyl alhehyde-9-O-beta-D-glucopyranoside, respectively. (C) 1997 Elsevier Science Ltd.