| abstract |
The invention relates to novel cephem compounds, of high antimicrobial activity, of the formula: ##STR1## wherein R 1 and R 9 are amino or acylamino; and n R 9 is a group of the formula: ##STR2## where R 2 is organic group, n X is CH or N, n Z is acid residue n Y is CH or N and n is O; or n Y is N.sup.⊕ --R 2 wherein R 2 is as defined above and n is 1, n or a group of the formula: n n --A--N.sup.⊕ (R.sup.10).sub.3 n n wherein n R 10 is lower alkyl and n A is lower alkylene. |