Compounds of formula I ##STR1## in which R.sup.1 is hydrogen, halogen, nitro, trifluoromethyl, lower alkyl or lower alkoxy; R.sup.2 is hydrogen or lower alkyl; R.sup.3 is hydroxy, 1H-tetrazol-5-yl or COOR.sup.4 wherein R.sup.4 is hydrogen or lower alkyl, and X is O, S, SO or SO.sub.2, are disclosed. The compounds of formula I are useful for treating allergic conditions. Methods for the preparation and use of the compounds are disclosed.
公式为I的化合物如下:##STR1## 其中R.sup.1为氢、卤素、硝基、三
氟甲基、低烷基或低烷氧基;R.sup.2为氢或低烷基;R.sup.3为羟基、
1H-四唑-5-基或COOR.sup.4,其中R.sup.4为氢或低烷基,X为O、S、SO或SO.sub.2。这些公式I化合物可用于治疗过敏症状。本文还公开了这些化合物的制备和使用方法。