| 摘要 |
7 beta -[2-(substituted or unsubstituted)-5-oxo-4-phenylimidazolidin-1-yl]-3-chloro-3-cephem-4-ca rboxylic acid represented by the formula: <IMAGE> (wherein R is hydrogen or hydroxy: R1 and R2 each is hydrogen, alkyl, aralkyl or aryl, or when taken together, they represent alkylene optionally having a hetero atom in its skeleton; and R3 is hydrogen or an organic or inorganic base group to form a carboxylate salt group. |
