| abstract |
Compounds of formula (I), and pharmaceutically acceptable salts thereof, wherein R<1> is C1-C4 alkyl; R<2> is C2-C4 alkyl; R<3> is H or SO2NR<4>R<5>; R<4> and R<5> together with the nitrogen atom to which they are attached form a pyrrolidino, piperidino, morpholino or 4-N-(R<6>)-1-piperazinyl group; and R<6> is H or C1-C3 alkyl; are selective cGMP PDE inhibitors useful in the treatment of, inter alia, cardiovascular disorders such as angina, hypertension, heart failure and atherosclerosis. |