This invention has anti-bacterial activity, below-mentioned formula (i) Formula - IKeto ride chemical compound and it regards the salt which that medicine can be allowed. This invention the medicine composition and offers also remedy of the microbial infection symptom which uses the chemical compound of this invention or preventive include the chemical compound of this invention method.< Selective figure >It is not本発明は、抗菌活性を有する、下記式(I)式-Iのケトライド化合物及びその医薬的に許容できる塩に関する。本発明は、本発明の化合物を含む医薬組成物及び本発明の化合物を用いた微生物感染症の治療又は予防方法をも提供する。【選択図】なし