Cephem compound

The present invention is concerned with a novel cephem compound, with a process for the production of this compound, which process may contain or consist of fermentative steps, chemical steps, and/orbiotransformation steps. A cephem compound according to the present invention characterised by formula (I) or a salt or ester thereof, wherein R is selected from the group consisting of (carboxymethylthio)propionyl (carboxyethylthio)propionyl Y- CH2-CO15 wherein Y is phenyl, phenoxy or tetrazolyl HOOC-X-CO wherein X is defined as (CH2)4 or wherein X is defined as (CH2)P-A-(CH2)q, wherein p and q each individually are 0, 1, 2, 3 or 4, and A is CH=CH, C-=C, CHB, C=O, O, S, NH, the nitrogen optionally being substituted or the sulfur optionally being oxidized, and B is hydrogen, halogen, C1-3 alkoxy, hydroxyl, or optionally substituted methyl, with the proviso that p+q should be 2 or 3, when A is CH=CH or C=-C, or p+q should be 3 or 4, when A is CHB, C=O, 0, S or NH or wherein X is (CH2)m-CH=A-(CH2)n or (CH2)m-C=-C-(C