Penicillins and processes for their preparation and use

Abstract From the Canadian patent

6-.alpha.-(Imidazolidin-2-on-1-carbonylamide)acetamido-penicillanic acids substituted in the 3-position of the imidazolidinone ring with phenyl or a substituted phenyl group and on the .alpha.-carbon atom of the acetamido bridge with a phenyl, thienyl, cyclohexenyl or cyclohexadienyl group, and their salts, are prepared by treatment of the corresponding 6-(.alpha.-aminoacetamido)penicillanic acid with a 3-substituted-imidazolidin-2-one-1-carboxylic acid derivative. The compounds, of which .alpha.-(3-phenylimidazolidin- 2-on-1-ylcarbonylamino)benzylpenicillin is a representative example, are antibacterial agents.