Keywords: Homogentisic acid.svg Skeletal formula of homogentisic acid melanic acid Created using http //www acdlabs com/download/chemsk html ACD/ChemSketch 8 0 and http //www inkscape org Inkscape Own 2007-04-28 Fvasconcellos 16 46 28 April 2007 UTC w Image Melanic-acid gif Aromatic acids Hydroquinones |