KA-6643-SERIES ANTIBIOTICS, PROCESS FOR PRODUCING SAME AND MEDICAL COMPOSITION CONTAINING SAME
摘要
<p>A-KA-6643-series antibiotic comprising at least one substance represented by any of the following formulae, or a salt or ester thereof: (1) (2) (3) (4) is effectively useful as an antibacterial and .beta.-lactamase inhibiting agent.</p>
