Compounds of formula (I)wherein:the groups are as defined in the description, are useful for the preparation of medicaments for the treatment of cardiovascular disorders, in particular heart failure and hypertension. The compounds are inhibitors of the enzymatic activity of the Na+,K+-ATPase.本發明係有關下式(I)所示化合物(其中各基團係如說明書所定義),其可用於製備供治療心血管疾病(特別是心臟衰竭和高血壓)的藥物。所述之化合物是具有Na+,K+-ATP酶的酶促活性之抑制劑。