Keywords: Beta-lactam antibiotics example 1.svg Skeletal formulae of the basic structures of penicillin 1 and cephalosporin 2 antibiotics highlighting the beta-lactam ring red Created using http //www acdlabs com/download/chemsk html ACD/ChemSketch 10 0 and Inkscape ;Legend red w Beta-lactam ring Own 2007-10-23 Fvasconcellos 19 02 23 October 2007 UTC Beta-lactam antibiotics |