| abstract |
Compounds represented by the general formula (I), esters of the compounds, derivatives thereof obtained through protection of amino on the 7-position thiazole ring, or pharmaceutically acceptable salts or solvates of them: (I) wherein T is S, SO, or O; X is halogeno, CN, carbamoyl which may be substituted with lower alkyl, lower alkyl, lower alkoxy, or lower alkylthio; A is substituted lower alkylene (wherein the substituent is optionally substituted mono-lower alkyl, optionally substituted lower alkylidene, or optionally substituted lower alkylene); and Z+ is an optionally substituted nitrogenous heterocyclic group having a cationic group. |