| abstract |
The present invention relates to new cephalosporins of the formula <IMAGE> I wherein R1 and R2 are hydrogen or carboxy, with the proviso that both cannot be the same; R3 is hydrogen or acetyl; and R4 is a radical selected from the group consisting of <IMAGE> <IMAGE> CHCHCH2R6 in which n is 1 or 2, R5 is hydrogen or acetyl, and R6 is hydrogen, a lower C1-3 alkyl, or a radical selected from the group consisting of <IMAGE> <IMAGE> in which n and R5 are as defined above. In another aspect, this invention relates to processes for the preparation of the compounds of Formula I, to pharmaceutical compositions containing at least one compound of Formula I, and to intermediates in their preparation. |