| 摘要 |
<p>The present invention relates to novel 7-acylamino and 7-amino-3-(substituted)carbonylamino-3(or 2)cephem-4-carboxylic acids and esters thereof, which are useful as antibiotics or as intermediates in preparing antibiotic substances respectively, and to a process for preparing said compounds. In particular, this invention relates to cephalosporins having in the 3-position a carbonylamino (isocyanato) or a substituted carbonylamino group, such as acylamino, ureido or substituted ureido, alkoxycarbonylamino, or (alkylthio) carbonylamino.</p> |
