G. Bourgeois et al., Atraric acid, a marker for epiphytic lichens in the wood used in cooperage: Identification and quantification by GC/MS/(MS), ANALUSIS, 27(3), 1999, pp. 281-283
A phenolic derivative, atraric acid, was identified by GC/MS and quantified
by GC/MS/MS in the outer parts of wood from oaks specifically colonised by
lichens. This compound was correlated to thr presence of a bitter depside,
atranorin, which is a natural metabolite of the lichen species belonging r
o the genus Parmelia.