Compounds of formula (I), wherein the groups are as defined in the specification, are very useful for the preparation of medicaments for the treatment of cardiovascular disorders, especially heart failure and hypertension. These compounds are inhibitors of the enzymatic activity of Na+, K+-ATPases. They are very useful for the manufacture of medicaments for the treatment of diseases caused by the hypertensive effects of endogenous ouabain, such as progression of renal failure in autosomal dominant polycystic kidney disease (ADPKD), preeclamptic hypertension and protein Urine and renal failure progression in patients with adducin polymorphisms.