Keywords: Pteridine-3D-balls.png Ball-and-stick model of the pteridine molecule a heterocyclic aromatic compound consisting of fused pyrimidine and pyrazine rings Derived from File Pyrimidine-3D-balls png and File Pyrazine-3D-balls-B png 2010-08-26 Jynto and Ben Mills Pteridine Images by Jynto |