2(1H)​-​Quinolinone, 7-​[4-​(4-​benzo[b]​thien-​4-​yl-​1-​piperazinyl)​butoxy]​-​1-​[4-​[(1,​2-​dihydro-​2-​oxo-​7-​quinolinyl)​oxy]​butyl]​-