3.5.2.6 beta-lactamase; penicillinase; cephalosporinase; neutrapen; penicillin beta-lactamase; exopenicillinase; ampicillinase; penicillin amido-beta-lactamhydrolase; penicillinase I; penicillinase II; beta-lactamase I; beta-lactamase II; beta-lactamase III • • •