| 摘要 |
<p>The compound represented by the formula: <IMAGE> where R1 stands for amino or an organic residue bonded through nitrogen; R2 stands for carboxyl or a group derivable therefrom; R3, R4, R5, R6, R7 and R8 independently stand for hydrogen or an organic residue, including the case where R5 or R6 forms a chemical bond or a ring with R7 or R8; X stands for hydrogen, methoxy or formylamino; or a salt thereof, produceable by the present method, exhibits excellent antimicrobial activity, and is utilized as antimicrobial agents.</p> |
