PROBLEM TO BE SOLVED: To provide an intermediate useful for producing an antibacterial compound and an industrially advantageous method for producing an antibacterial agent.SOLUTION: The antibacterial compound represented by chemical formula 1 can be produced at a low cost by producing the intermediate compound (III-1).COPYRIGHT: (C)2010,JPO&INPIT【課題】抗菌薬の工業的に有利な製造法を提供する。【解決手段】中間体化合物(III-1)を製造することで、下記で表される抗菌化合物を安価に製造できる。【選択図】なし