Methyl everninate has been identified as the major constituent of the deuterochloroform extract of ten specimens of the liverwort Plagiochila killarniensis. Using NMR fingerprinting and GC-MS, the new methyl 6-hydroxy- 2-methyl-3,4-methylenedioxybenzoate and three other methyl orsellinate derivatives were identified as minor components. 9,10-Dihydro-3,5- dimethoxyphenanthren-2-ol and 9,10-dihydro-3-methoxyphenanthrene-4,5-diol, previously reported from a Neotropical Plagiochila, were also present. Killarniensolide, a new phthalide, was isolated; its structure was elucidated as 3-(2-hydroxy-4,5-dimethoxybenzyl)-7-methoxyphthalide by NMR spectroscopy, GC-MS and isolation of an acetate derivative. Chemical differences between specimens from Scotland and the Azores were relatively minor but characteristic; small differences between some of the Scottish materials were also observed.
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