PROBLEM TO BE SOLVED: To provide a nitrogen-containing compound useful for the prevention or treatment of bacterial infection.SOLUTION: The present invention provides a compound of formula (I), its preparation, and a method for the prevention or treatment of bacterial infection.SELECTED DRAWING: Figure 1【課題】細菌感染の予防又は治療に有用な窒素含有化合物を提供すること。【解決手段】式(I)の化合物、その調製、及び細菌感染の予防又は治療方法。【選択図】図1