| abstract |
A 5-membered cyclic compound of the formula:n nwherein X is oxygen or sulfur,R 1 is hydrogen, substituted or unsubstituted alkyl, etc., R 2 is hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, etc., Y 1 is a direct bond, substituted or unsubstituted alkylene, -CO(CH 2 ) n -, etc., the wavy line means (E)-configuration or (Z)-configuration, R 3 is substituted or unsubstituted aryl, etc., Y 2 is substituted or unsubstituted alkylene, etc., R 4 is hydrogen, substituted or unsubstituted alkanoyl, substituted or unsubstituted alkyl, etc., R 5 is hydrogen, etc., or a salt thereof, these compound being able to inhibit infiltration of leukocytes such as eosinophils and lymphocytes, by which being useful for the treatment of various kinds of inflammation. |