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Published on: February 25, 2021
Chlorinated bianthrones from the cyanolichen Nephroma laevigatum
Aurélie Lagarde1, Lengo Mambu1, Phuong-Y Mai1
1Departement de Pharmacognosie, Faculté de Pharmacie, Université de Limoges, 2 rue du Dr Marcland, 87025 Limoges Cedex, France.
Abstract:
While depsidones, depsides or dibenzofuran-like compounds dominate the chemical composition of lichens, the cyanolichen Nephroma laevigatum affords a diversity of quinoid pigments represented by chlorinated anthraquinones derived from emodin and new bianthrones resulting from the homo- or heterodimerization of monomers. Bianthrones were pointed out from the dichloromethane extract by MS/MS-based molecular networking, then isolated and characterized on the basis of extensive spectroscopic analyzes and GIAO NMR shift calculation followed by CP3 analyzes.
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