2.5- Di-O-methylhiascic acid

Elix JA, Engkanian U (1976a) 3-Hydroxyphysodic acid. Chemical corroboration of the structure of this lichen depsidone. Aust J Chem 29 2693-2699 Elix JA, Engkanian U (1976b) 4,5-Di-O-methylhiascic acid, a new tridepside from the lichens Parmelia pseudofatiscens and Parmelia horrescens. Aust J Chem 29 2701-2705... 

Di-O-methylhiascic acid OH H OMe OMe OH CO2H OH Parmelia pseudofatiscens Benzylation/ hydrogenolysis Spectral data synthesis (777)... 

Di-O-methylhiascic Acid, a New Tridepside from the Lichens Parmelia pseudofatiscens and Parmelia horrescens. Austral. J. Chem. 29, 2701 (1976). 

JA Elix, VK Jayanthi, CC Leznoff. 2,4-Di-O-methylgyrophoric acid and 2,4,5-tri-O-methylhiascic acid. New tridepsides from Parmelia damaziana. Austral J Chem 34 1757-1761, 1981. 

Elix, J. A., V. K. Jayanthi, and C. C. Leznoff 2,4-Di-O-methylgyrophoric Acid and 2,4,5-Tri-O-methylhiascic Acid. New Tridepsides from Parmelia damaziana. Austral. J. Chem. 34, 1757 (1981). 

In Parmelinopsis species the tridepsides 2,4-di-O-methylhiascic acid P. spumosa), 2,5-di-O-methylhiascic acid P. neodamaziana), 3-hydro-xygyrophoric acid P. subfatiscens) and 3-hydroxy-4-0-methylumbili-caric acid (P. subfatiscens) have been detected (Elix JA, Wardlaw JH (2000) Four New Tridepsides from Parmelinopsis species. Australasian Lichenology 47 8). 

---