| http://www.w3.org/ns/prov#value | - Accordingly, the present invention in one embodiment provides cephalosporin compounds having the general formula (I), ##STR2## wherein X is a hydrogen atom, a chlorine atom, a methyl group, a methoxy group, an acetoxymethyl group or --CH2 SHet wherein Het is a 5- or 6-membered heterocyclic ring containing therein 1 to 4 nitrogen, oxygen or sulfur atoms; R1, R2 and R3 each independently is a hydrog
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