CEPHALOSPORIN DERIVATIVES

摘要

RAN 4410/143 Cephalosporin derivatives of the general formula in which X represents one of the groups (a) (b) wherein R1 represents lower alkyl or (together with the oxygen) a readily hydrolysable ether group, as well as readily hydrolysable esters of the compounds of formula I wherein X represents the group (b) or (a) in which R represents lower alkyl and salts of these compounds and hydrates of the compounds of formula I or of esters and salts thereof. Further, also corresponding preparations, the use of these products in the treatment of illnesses, the manufacture of the active substances as well as intermediates thereby occurring.