The depside dissectic acid [methyl 3-(3'-formyl-2',4'-dihydroxy-6'-methylbenzoyloxy)-4,6-dihydroxy-2,5-dimethylbenzoate] (2) has been isolated from the lichen Heterodermia dissecta together with atranorin (1). The structure of the compound (2) followed from a combination of spectroscopic data and was confirmed by synthesis.
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Elix et al. (1996) studied this question.