Keywords: 6,7-dimethyl-8-ribityllumazine.svg Skeletal formula of 6 7-dimethyl-8-ribityllumazine Created using http //www acdlabs com/download/chemsk html ACD/ChemSketch 10 0 and Inkscape Own 2007-05-27 Fvasconcellos 17 41 27 May 2007 UTC Ketones Pteridines |