Two New Aliphatic Acids From the Lichen Parmotrema praesorediosum

Abstract

The new aliphatic acids, (+)- praesorediosic acid [2-(14′-carboxytetradecyl)-4-methyl-5-oxo-2,5-dihydrofuran-3-carboxylic acid] (1) and (+)- protopraesorediosic acid [2-(14′-carboxytetradecyl)-4- methylene-5-oxo-2,5-tetrahydrofuran-3-carboxylic acid] (4) have been isolated from the lichen Parmotrema praesorediosum.