Keywords: Cephalosporin core structure.svg validSVG Core structure of the cephalosporin antibiotics Created using http //www acdlabs com/download/chemsk html ACD/ChemSketch 10 0 and Inkscape Adapted from Image Beta-lactam antibiotics example 1 svg 2008-08-23 Fvasconcellos Image Cephalosporin-nucleus png Cephalosporin antibiotics |