| 摘要 |
<p>A compound represented by general formula (I), which is useful as an intermediate for the production of a clinically excellent synthetic antibacterial, a salt thereof, and a process for producing the same. In said formula, R1 represents hydrogen or a carboxyl protective group, R2 represents hydrogen or lower alkyl, X1 represents hydrogen or halogen, X2 represents halogen, X5a represents hydrogen or halogen, A represents methylene, =CH-COOR4, etc., and B represents methylene or carbonyl, provided that A and B should not be methylene groups at the same time.</p> |
