6-beta-bromopenicillanic acid , which arises from the epimerization of 6-alpha-bromopenicillanic acid in aqueous solution or from hydrogenation of 6,6-dibromopenicillanic acid , is a powerful , irreversible , active-site-directed inhibitor of several typical beta-lactamases ( penicillinase ; penicillin amido-beta-lactamhydrolase , ec 3.5.2.6 ) ;
C0030841
penicillinase
C0597979
beta-lactamhydrolase