Pharmaceutically active compounds

   
   

Compounds of general formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, X, Y and A have the meanings given herein which are useful in the curative and prophylactic treatment of a medical condition for which inhibition of a cyclic guanosine 3',5'-monophosphate phosphodiesterase (e.g. cGMP PDE5) is desired.

Compuestos del fórmula general (i): ## del ## STR1 en donde R.sup.1, R.sup.2, R.sup.3, R.sup.4, X, Y y A tienen los significados dados adjunto que son útiles en el tratamiento curativo y profiláctico de una condición médica para la cual la inhibición de un guanosine cíclico 3', phosphodiesterase 5'-monophosphate (e.g. GMP PDE5) se desee.

 
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