摘要:
A cephem compound of the general formula: , wherein R₁ is an amino group which may be protected, Q is nitrogen or a group of C-R₂ in which R₂ is hydrogen or a halogen, R₃ is hydrogen or a hydrocarbon residue which may be sub stituted, A is a triazolopyridinyl, triazolopyridazinyl or triazolo pyrazinyl group which may be substituted, , or a salt or ester thereof , and a process for preparing the same and a pharmaceutical composition thereof are disclosed.