Argopsin, also known as 1-chloropannarin, is a secondary metabolite produced by many lichen species, such as Biatora cuprea[1] and Micarea lignaria.[2] Argopsin was first isolated from the lichen Argopsis friesiana.[3] The chemical name of argopsin is 2,7-dichloro-3-hydroxy-8-methoxy-1,6,9-trimethyl-11-oxo-11H-dibenzo[b,e][1,4]dioxepin-4-carbaldehyde.
^Huneck, Siegfried; Lamb, I.Mackenzee (1975). "1'-Chloropannarin, a new depsidone from Argopsis friesiana: Notes on the structure of pannarin and on the chemistry of the lichen genus Argopsis". Phytochemistry. 14 (7): 1625–1628. doi:10.1016/0031-9422(75)85363-5.
^Fournet, Alain; Ferreira, Maria-Elena; De Arias, Antonieta Rojas; De Ortiz, Susana Torres; Inchausti, Alba; Yalaff, Gloria; Quilhot, Wanda; Fernandez, Ernesto; Hidalgo, Maria Elena (1997). "Activity of Compounds Isolated from Chilean Lichens Against Experimental Cutaneous Leishmaniasis". Comparative Biochemistry and Physiology Part C: Pharmacology, Toxicology and Endocrinology. 116 (1): 51–54. doi:10.1016/S0742-8413(96)00127-2. PMID9080673.