Indole cephalosporin derivatives

A compound selected from the formula ##STR11## wherein W is hydrogen, a --CO.sub.2 R.sub.4 group wherein R.sub.4 is hydrogen, a straight or branched 1 to 4 carbon alkyl group, a straight or branched alkanoyloxymethyl group in which the alkanoyl group has from 2 to 5 carbon atoms;

• R.sub.1 is hydrogen or methoxy;
• R.sub.2 is chloro, bromo or methoxy, R.sub.3 is hydrogen, a straight or branched alkyl group of from 1 to 4 carbon atoms, a straight or branched alkanoyloxymethyl group in which the alkanoyl moiety has from 2 to 5 carbon atoms and is straight or branched, an alkanoylaminomethyl group in which the alkanoyl moiety is straight or branched and has from 2 to 5 carbon atoms and the amine nitrogen is substituted with a straight or branched alkyl group having 1 to 4 carbon atoms or is unsubstituted;
• an alkoxycarbonylaminomethyl group in which the alkoxy moiety is straight or branched and has from 1 to 4 carbon atoms and the amine nitrogen is substituted with a straight or branched alkyl group of from 1 to 4 carbon atoms or is unsubstituted, p-(alkanoyloxy)benzyl group in which the alkanoyl moiety is straight or branched and has from 2 to 5 carbon atoms;
• an aminoalkanoyloxymethyl group in which the alkanoyl moiety has from 2 to 15 carbon atoms and the amino nitrogen is mono- or di-substituted with a straight or branched alkyl group having from 1 to 4 carbon atoms or is unsubstituted;
• or pharmaceutically acceptable salts thereof.