1,6-Dihydro-5-[5-[[4-(2-hydroxyethyl)-1-piperazinyl]sulfonyl]-2-propoxyphenyl]-1-methyl-3-propyl-7H-pyrazolo[4,3-d]pyrimidin-7-one

1,6-Dihydro-5-[5-[[4-(2-hydroxyethyl)-1-piperazinyl]sulfonyl]-2-propoxyphenyl]-1-methyl-3-propyl-7H-pyrazolo[4,3-d]pyrimidin-7-one