| abstract |
A compound, a pharmaceutically acceptable salt thereof, or a hydrate thereof having PGD2-antagonistic activities, inhibitory activities against infiltration of eosinophils, and being useful as a drug for treating diseases, such as systemic mastocytosis and disorder of systemic mast cell activation, as well as tracheal contraction, asthma, allergic rhinitis, allergic conjunctivitis, urticaria, ischemic reperfusion injury, inflammation and atopic dermatitis , which is shown by formula (I), is provided. |