| 摘要 |
<p>An intermediate of formula (I) for the synthesis of a compound of formula (III) which has an excellent antibacterial action; and a process for producing the intermediate of formula (I) by the ring closure of a compound of formula (II), wherein R1 represents hydrogen or lower alkyl, R2 represents a protective group of a nitrogen atom, and R3 represents a protective group of a sulfur atom.</p> |
