abstract |
The present invention relates to compounds of formula (I) or a pharmaceutically acceptable salt, solvate or hydrate thereof, wherein R is R, and their use in a method of treatment or prevention of a disease ameliorated by the inhibition of PDE-5 in a human or non-human mammal 1 、R 2 、R 3 、R 4 、R 5 And X is as defined herein. |