There are described compounds of formula I, ##STR1## in which R.sub.5, R.sub.6, R.sub.7 and R.sub.8, which may be the same or different, are hydrogen, alkyl C2 to 6, alkoxy C2 to 8, hydroxy-alkoxy C3 to 8, and R.sub.5 may be hydroxy, provided that one or two of R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are other than hydrogen, and pharmaceutically acceptable derivatives thereof. The compounds of formula I are indicated for use in the treatment of asthma, and pharmaceutical compositions containing them and processes for their preparation are also described.
本文描述了式I的化合物,##STR1## 其中R.sub.5、R.sub.6、R.sub.7和R.sub.8可以相同或不同,分别为氢、烷基C2到6、烷氧基C2到8、羟基-烷氧基C3到8,其中R.sub.5可以为羟基,但要求R.sub.5、R.sub.6、R.sub.7和R.sub.8中至少有一个或两个不是氢,并且它们的药学可接受衍
生物。式I的化合物适用于治疗哮喘,并且还描述了含有它们的药物组合物以及它们的制备方法。