Anthraquinones and xanthones

Anthraquinones and xanthones are also important constituents of many lichens. Anthraquinmies such as parietin, parietinic acid, emodin, fallacinol, and fallacinal were shown to have a high antimicrobial effect (Manojlovic et al. 2002). Manojlovic et al. (2010) found that the antimicrobial activity of Uchen Laurera benguelensis is mainly related to the presence of Uchexanthone. 

No clear mechanisms have been identified that specifically indicate how depsides, tridepsides, tetradepsides, depsidones, anthraquinones, and xanthones target microbial invasion. 

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