PROBLEM TO BE SOLVED: To obtain an antibacterial agent comprising a compound isolated from a microbial culture solution and having an excellent antibacterial activity and to provide a method for using the compound as a synthetic intermediate when a derivative is synthesized from the compound.SOLUTION: This antibacterial agent comprises a compound represented by the formula (wherein R3 denotes methoxy group, hydroxyl group, amino group, or the like and R4 denotes hydrogen atom or methyl group), or the like, or its salts. Furthermore, the method for using the compound as an intermediate in the synthesis of the derivative thereof is provided.COPYRIGHT: (C)2001,JPO【課題】 微生物培養液から単離される優れた抗菌活性を有する化合物を含有する抗菌剤及びそれら化合物から誘導体を合成する際に有用な合成中間体としての使用方法を提供する。【解決手段】 式【化1】(式中、R3はメトキシ基、水酸基、アミノ基等を示し、R4は水素原子またはメチル基を示す)等で表わされる化合物又はその塩を含有する抗菌剤及びその誘導体合成における中間体としての使用方法。
