title: A sulfone beta-lactam compound which acts as a beta-lactamase inhibitor.
abstract: CP-45,899 [3,3-dimethyl-7-oxo-4-thia-1-azabicyclo(3,2,0)heptane-2-carboxylic acid, 4,4-dioxide [2S-(2alpha,5alpha)]] has low intrinsic activity against most Gram-positive cocci, Enterobacteriaceae and Pseudomonas. It inhibits Neisseria at concentrations of 0.1 approximately 6.2 microgram/ml. The combination of CP-45,899 and ampicillin inhibited Staphylococcus aureus and Enterobacteriaceae resistant to ampicillin by virtue of beta-lactamase activity. Combination of CP-45,899 and cephalothin was synergistic less often, and CP-45,899 did not act synergistically with carbenicillin or ticarcillin against Pseudomonas resistant to these agents. CP-45,899 acted synergistically with ampicillin against Bacteroides. Synergy of CP-45,899 and ampicillin was demonstrated at varying concentrations suggesting that it may significantly enlarge the antibacterial activity of ampicillin against resistant bacteria.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001419:Bacteria / Q000201:enzymology; D004357:Drug Synergism; D008826:Microbial Sensitivity Tests; D013211:Staphylococcus aureus / Q000187:drug effects; D013450:Sulfones / Q000494:pharmacology*; D013997:Time Factors; D065093:beta-Lactamase Inhibitors; D047090:beta-Lactams / Q000494:pharmacology*
chemical_list: D000900:Anti-Bacterial Agents; D013450:Sulfones; D065093:beta-Lactamase Inhibitors; D047090:beta-Lactams