https://www.researchgate.net/profile/John_Elix/publication/263020117_2%27-O-Methylphysodic_acid_and_hydroxyphysodic_acid_two_new_depsidones_from_the_lichen_Hypogymnia_billardieri/links/5ccd77d4299bf14d957682df/2-O-Methylphysodic-acid-and-hydroxyphysodic-acid-two-new-depsidones-from-the-lichen-Hypogymnia-billardieri.pdf
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