Chemical Investigation of Sulcaria virens (Alectoriaceae)

A new linoleic acid derivative,was isolated from the lichen Sulcaria virens together with 12 known compounds.The structure of the new compound was determined as 9,10-O-isopropyllidene-(12Z)-en-octadecaoic acid(1)by spectroscopic analysis.Other 12 known compounds were(9Z,12Z)-octadecadienoic acid(2),evernic acid(3),(R)-usnic acid(4),vulpinic acid(5),atranorin(6),virensic acid(7),abieslactone(8),3α-hydroxylanosta-7,24-dien-26,23R-olide(9),taraxerol(10),taraxerone(11),5α,8α-epidioxy-(22E,24R)-ergosta-6,22-dien-3β-ol(12),2,2'-tetrahydrosqualene(13).