| 摘要 |
<p>The invention concerns 7-amino-ceph-3-em-4-carboxylic acid compounds of the formula <IMAGE> (I) wherein R1a represents hydrogen or an amino protective group R1A and R1b represent hydrogen or an acyl group AC, or R1A and R1b together denote a bivalent amino protective group, and R2 represents hydrogen or an organic radical R2A which together with the -C(=O)-O- grouping forms a protected carboxyl group, or salts such compounds which possess salt-forming groups; these compounds have antibiotic properties.</p> |
