the degradation of 6- [ ( r ) -2- ( 2-oxo-imidazolidine-1-carboxamido ) -2-phenyl-acetamido ] penicillanic acid na-salt ( azlocillin , securopen ) and 6- [ ( r ) -2- [ 3-methylsulfonyl-2-oxoimidazolidine-1-carboxamido ] -2-phenyl-acetamido ] penicillanic acid na-salt ( mezlocillin , baypen ) , two chemically related acylureido penicillins , was tested in biological material ( plasma and urine ) and borate buffer at 37 degrees c over the time period of at least 6 h .
C0030820
penicillanic acid
C0030842
penicillins