| abstract |
A cephem derivative represented by the general formulawherein R' represents hydrogen or methyl, R<sup>2</sup> represents carboxyl or esterified carboxyl, and n represents 0 or 1, or a pharmaceutically acceptable salt thereof; intermediates for cephem derivative or salt thereof; processes for producing these compounds; and a pharmaceutical composition and method for preventing or treating bacterial infectious diseases, wherein the cephem derivative or the salt thereof is used. |