7H-​Pyrazolo[4,​3-​d]​pyrimidine-​7-​thione, 1,​6-​dihydro-​5-​[5-​[[4-​(2-​hydroxyethyl)​-​1-​piperazinyl]​sulfonyl]​-​2-​propoxyphenyl]​-​1-​methyl-​3-​propyl-