abstract |
Pyrimidine derivatives of the formula (I) and physiologically acceptable salts thereof, in which R<SUP>1</SUP>, R<SUP>2</SUP>, R<SUP>3</SUP>, R<SUP>4</SUP>, W, X, Y and Z are as defined in claim 1, exhibit phosphodiesterase V inhibition and can be employed for the treatment of diseases of the cardiovascular system and for the treatment and/or therapy of potency disorders |