There are presented cephalosporin derivatives of the formula ##STR1## wherein X is the group ##STR2## R is hydrogen or a readily hydrolyzable ester or ether group and n stands for 1 or 2, as well as salts of these compounds and hydrates of these compounds and salts.
提供了公式为##STR1##的
头孢菌素衍
生物,其中X是##STR2##,R是氢或容易
水解的酯或醚基团,n为1或2,以及这些化合物的盐和这些化合物和盐的
水合物。