The purpose is to provide a compound which can overcomes the disadvantages of conventional steroid drugs and NSAID. It is found that specific epoxy monohydroxy forms of eicosapentaenoic acid, d ocosahexaenoic acid and docosapentaenoic acid which are independently represented by formulae [chemical formula 1], [chemical formula 5] and the like have an inhibitory activity on neutrophils. This compound can inhibit the invasion of neutrophils into tissues and the activation of neutrophils which are observed in acute inflammations.
