3H-​Indolium, 1-​[2-​[2-​[2-​(acetyloxy)​ethoxy]​ethoxy]​ethyl]​-​2-​[7-​[1-​[2-​[2-​[2-​(2-​azidoethoxy)​ethoxy]​ethoxy]​ethyl]​-​1,​3-​dihydro-​3,​3-​dimethyl-​2H-​indol-​2-​ylidene]​-​1,​3,​5-​heptatrien-​1-​yl]​-​3,​3-​dimethyl-​, chloride (1:1)