| abstract |
The present invention relates to cephalosporins of general formula: ##STR1## in which: R 1 is H or CH 3 , R 2 is CH 3 , or R 1 and R 2 taken together form a 1,3-propylene group, n R 3 is lower alkyl, alkenyl, alkynyl or CH 2 COO alkyl, n R 4 is H or OH, the S being bonded to the pyridine ring in 2 or 4 position, n A is H or cation or ester or hemiacetal which is easily hydrolyzable, n and X is a derivative of a mineral or organic acid. n The invention also relates to a process for preparing these new cephalosporins and to the drugs containing said cephalosporins. |