Phenoxyalkylcarboxylic acid derivative represented by the following formula,
wherein R
1
indicates hydrogen atom, methyl group or ethyl group, m is an integer from 2 to 5, and n is an integer from 3 to 8, X
1
and X
2
each independently represent sulfur atom, oxygen atom, sulfinyl group or sulfonyl group, proviso X
1
and X
2
are not simultaneously oxygen atom; their alkali salts and hydrates thereof are useful as antiallergic agents.
以下式子所表示的苯氧基烷基
羧酸衍
生物,其中R1表示氢原子、甲基或乙基,m为2到5的整数,n为3到8的整数,X1和X2分别独立表示
硫原子、氧原子、亚
硫酰基或磺酰基,前提是X1和X2不同时为氧原子;它们的碱盐和
水合物可用作抗过敏药物。