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The crystalline and amorphous constituents of Letharia vulpina collected at Flensjoen, Sor-Trendelag, Norway, have been identified as atranorin, vulpinic-, pulvinic-, usnic-, benzoic- and hydroxyfatty acids. Vulpinic acid thallate(I) and vulpinic acid isopropylether have been prepared as new derivatives. The identity of the compounds was established by consideration of elemental analyses, infrared, mass and nuclear magnetic resonance spectra, and thin layer chro­matography.

Studies on the Chemistry of Lichens, XVIII * Chemical Investigation of the Species Letharia vulpina (L .) Hue and New Derivatives of Vulpinic Acid