Acetamide, N-​[2-​[2-​(2-​aminoethoxy)​ethoxy]​ethyl]​-​2-​[[2-​(2,​6-​dioxo-​3-​piperidinyl)​-​2,​3-​dihydro-​1,​3-​dioxo-​1H-​isoindol-​4-​yl]​oxy]​-​, hydrochloride (1:1)