发明授权
US4349672A Cephalosporin derivatives 失效
头孢菌素衍生物

Cephalosporin derivatives
摘要:
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.
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