2,2'-((4,4'-Bipiperidine)-1,1'-diyldi-2,1-ethanediyl)bis-7H-pyrido(4,3-c)carbazolium dichloride 74517-50-3 7H-Pyrido(4,3-c)carbazolium, 2,2'-((4,4'-bipiperidine)-1,1'-diyldi-2,1-ethanediyl)bis-, dichloride