| abstract |
The compound of the formula I and a method for its preparation are described, wherein R1, R2 and R3 are the same or different and mean hydrogens, halogens, alkyl, nitro, amino, alkylcarbonylamino, alkylamino or dialkylamino groups; R4 means -alkyl-aryl or -alkyl-heteroaryl; X means CH2, oxygen atom or sulfur atom; n is 2 or 3; including the individual (R) and (S) enantiomers or mixtures of enantiomers thereof; including pharmaceutically acceptable salts and esters thereof. The compounds have potentially valuable pharmaceutical properties for the treatment of cardiovascular disorders such as hypertension and chronic heart failure. |