certain semi-synthetic penicillins and cephalosporins have been found to be competitive inhibitors of selected beta-lactamases but an examination of streptomycete culture fluids has revealed two new types of beta-lactam compound : clavulanic acid , which is a progressive inactivator of a wide range of beta-lactamases , and the olivanic acids , which are both broad-spectrum antibiotics and potent beta-lactamase inhibitors .
C0030842
penicillins
C0282215
beta-lactam