using a variety of beta-lactamases including those from escherichia coli ( tem-1 ) , enterobacter cloacae p99 and staphylococcus aureus the inhibition profiles ( i50 values ) were determined for various groups of compounds including penicillins , penicillanic acid derivatives ( sulphone and beta-halo substitutions ) , olivanic acids and clavulanic acid derivatives including substituted ethers and amines .
C0030842
penicillins
C0030820
penicillanic acid