Compounds of formula I
free or salt form, wherein —C—Y—, R
1
and R
2
are G have the meanings as indicated in the specification, are useful for treating conditions that are prevented or alleviated by activation of the β
2
-adrenoreceptor. Pharmaceutical compositions that contain the compounds and a process for preparing the compounds are also described.
化合物的公式为Ifree或盐形式,其中—C—Y—,R1和R2是G,其含义如规范中所示,对于预防或缓解通过激活β2-
肾上腺素受体引起的病症是有用的。还描述了含有这些化合物的制药组合物和制备这些化合物的过程。