Keywords: Usnic acid.svg Skeletal formula of racemic usnic acid Created using http //www acdlabs com/download/chemsk html ACD/ChemSketch 10 0 and Inkscape Own work from ChEBI entry http //www ebi ac uk/chebi/searchId do chebiId CHEBI 3A38319 38319 2007-10-28 Fvasconcellos 03 06 28 October 2007 UTC w Image Usnicacid jpg Usnic acid |