Orcinol tetradepsides

Bryan AJ, Elix JA (1976) 2-0-Acetyltenuiorin, a new tridepside from the lichen Pseudo cyphellaria australiensis. Aust J Chem 29 1147-1151 Bryan AJ, Elix JA, Norfolk S (1976) Synthesis of orcinol tridepsides and aphthosin, an orcinol tetradepside. Aust J Chem 29 1079-1086... 

Finally aphthosin (278), an orcinol tetradepside was obtained through condensing evernic acid (279) and methyl lecanorate (280) (Scheme 36) (57). The properties of this synthetic material were identical with those of the natural product isolated by Bachelor and King 10), although a reinvestigation of the constituents of Peltigera aphthosa failed to verify the natural occurrence of this tetradepside 234). 

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