Fragilin
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Fragilin is a chemical compound of the anthraquinone class. It has the molecular formula C16H11ClO5 and is a chlorinated derivative of parietin. In 1965, it was reported as a constituent of the lichens Sphaerophorus fragilis and Sphaerophorus coralloides. It has since been found in a variety of other lichens including Nephroma laevigatum, Caloplaca, Xanthoria parietina, and others.