Abstract
Column chromatography of an extract of the lichen Ramalina stenospora Müll. Arg. yielded usnic acid (0·013%), a mixture of atranorin and chloroatranorin (0·007%), perlatolic acid (0·40%) and a new para-depside, stenosporic acid (0·37%). Stenosporic acid was proven to be 4-(2-hydroxy-6-propyl- p-anisate)-6-pentyl-β-resorcylic acid. A methyl ester synthesized by condensation of the appropriate phenolic units was found to be identical to the methyl ester prepared from stenosporic acid with diazomethane.
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