<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A group of penicillins with extended gram-negative bacterial coverage, including Ticarcillin, Piperacillin, Carbenicillin, Timentin and Mezlocillin.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>