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Abstract

The present invention relates to a cephalosporin compound represented by the following general formula (I), its pharmaceutically acceptable non-toxic salt, physiologically hydrolyzable ester, hydrate or solvate, or isomers thereof, which is useful as an antibiotic agent: ##STR1## in which R.sup.1 represents hydrogen or an amino-protecting group, R.sup.2 and R.sup.3 can be identical or different and each represent hydrogen or a hydroxy-protecting group, or R.sup.2 and R.sup.3 together can form a diol-protecting cyclic group, R.sup.4 represents hydrogen or a carboxyl-protecting group, R.sup.5 represents hydrogen, C.sub.1-4 alkyl, alkoxycarbonyl, carboxyl or sulfomethyl, R.sup.6 represents hydrogen, amino or substituted amino, and R.sup.7 represents C.sub.1-4 alkyl, amino or substituted amino, or R.sup.5 and R.sup.6 together with the carbon atoms to which they are attached can form a 3 to 7-membered cyclic group, or R.sup.6 and R.sup.7 together with the carbon and nitrogen atoms to which they are attached can form a 3 to 7-membered heterocyclic ring which may optionally contain additional heteroatoms such as nitrogen and/or oxygen and which may be substituted with the substituents selected from C.sub.1-4 alkyl, amino and substituted amino, and Q represents CH or N.

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First Claim