(9,9'-Bianthracene)-2,2',7,7'-tetramine, N,N,N',N',N'',N'',N''',N'''-octamethyl- 60683-51-4 N,N,N',N',N'',N'',N''',N'''-Octamethyl-(9,9'-bianthracene)-2,2',7,7'-tetramine