in an attempt to clarify the role of a side chain , n4-methyl-d-asparagine , of aspoxicillin ( aspc ) in the antibacterial action , we examined the bactericidal activity of dehydroxyaspoxicillin ( ab-aspc ) and its affinity for the penicillin-binding proteins ( pbps ) of escherichia coli using piperacillin ( pipc ) , mezlocillin ( mzpc ) and apalcillin ( appc ) as the reference penicillins .
C0031955
piperacillin
C0030842
penicillins