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Betalactam core structures.svg validSVG Core structures of the betalactams Side chains omitted for clarity Created using acdlabs html ACD and Inkscape Optimized with vim Legend Penam core Carbapenam core Oxapenam core Penem core Carbapenem core Monobactam core Cephem core Carbacephem core Oxacephem core Own Fvasconcellos Betalactam