PROBLEM TO BE SOLVED: To provide an anti-infective agent which has wide antibacterial spectrum to various pathogenic bacteria regardless of the presence or absence of drug resistance.SOLUTION: A nybomycin ester derivative is represented by general formula (1). In the general formula (1), R1 denotes any one of OCOCH3, OCOCH(CH3)2 and OCOCH2CH2CH3.COPYRIGHT: (C)2013,JPO&INPIT【課題】薬剤耐性の有無に関わらず様々な病原性細菌に対して幅広い抗菌スペクトラムを有する感染症治療薬の提供。【解決手段】下記一般式(1)で表されるナイボマイシンエステル誘導体。前記一般式(1)において、R1は、OCOCH3、OCOCH(CH3)2、及びOCOCH2CH2CH3のいずれかを表す。【選択図】なし