Phenoxyalkylcarboxylic acid derivatives of the following formula, ##STR1## wherein R.sup.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.sup.1 and X.sup.2 each independently represent sulfur atom, oxygen atom, sulfinyl group or sulfonyl group, proviso X.sup.1 and X.sup.2 are not simultaneously oxygen atom; their alkali salts and hydrates thereof are useful as antiallergic agents.
以下式子的
苯氧基烷基
羧酸衍
生物,其中,R.sup.1表示
氢原子、
甲基或乙基,m为2至5的整数,n为3至8的整数,X.sup.1和X.sup.2各自独立地表示
硫原子、
氧原子、
亚砜基或磺酰基,前提是X.sup.1和X.sup.2不同时为
氧原子;它们的碱盐和
水合物可用作抗过敏剂。