| abstract |
Acyl derivatives of the general formula are described in which R 'is a 3-substituent which can be used in cephalosporin chemistry, R 2 is hydrogen, lower alkyl or COOR 3- lower alkyl, in which R 3 is hydrogen, a cation of a base or an easily hydrolyzable ester group, and X is sulfur, oxygen or represents one of the groups -SO- and -S02- as well as easily hydrolyzable esters, easily hydrolyzable ethers and salts of these compounds and hydrates of the compounds of formula I or their esters, ethers and salts, their use in the treatment or prophylaxis of diseases , in particular infectious diseases, their production and new starting compounds that can be used. |