Lignans from the liverworts Lepidozia incurvata, Chiloscyphus polyanthos and Jungermannia exsertifolia ssp cordifolia

Three foliose liverworts from the order Jungermanniales were examined for t he presence of lignans. They all contained the typical liverwort lignans, i .e. cyclolignans of the dihydronaphthalene and naphthalene type and conjuga ted with alpha-L-rhamnose, malic acid and shikimic acid, respectively. The new lignans were 3-carboxy-6-methoxy-1-(3',4'-dihydroxyphenyl)-naphthalene- 7-O-alpha-L-rhamnopyranoside, 3-carboxy-6,7-dihydroxy-1-(3',4'-dihydroxyphe nyl)-naphthalene-9,2"-O-malic acid ester and 3-carboxy-6,7-dihydroxy-1-(3 ' ,4'-dihydroxyphenyl)-naphthalene-9,5"-O-shikimic acid ester. (C) 1999 Elsev ier Science Ltd. All rights reserved.