| abstract |
A compound of formula (I): <IMAGE> (I) or a salt thereof, in which Y is a group-O(CH2)mCH<, -(CH2)mCH<, or -CH=C< where m is an integer of from 1 to 5, n is an integer of from 4 to 12, each of R1 and R2, which may be the same or different, represents hydrogen or C1-6 alkyl, X represents a double or triple bond, and each of A and B represents hydrogen when X is a double bond, or both A and B are absent when X is a triple bond, is useful in treating allergic diseases. |