| 摘要 |
A cephem compound, wherein the cephem ring has a substituent at the 3-position, which substituent is shown by the formula II, wherein Het is a mono- or polycyclic heterocyclic group comprising one or more hetero atoms selected from the group consisting of N, O and S which may be the same or different from each other; R<1> is hydrogen, an optionally substituted lower alkyl or an optionally substituted lower alkenyl; A is an optionally substituted lower alkylene, an optionally substituted lower alkenylene or a single bond; B is an optionally substituted imino or a single bond; or A and B taken together may form a single bond; and D is a single bond or a group of the formula (a): <CHEM>
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