N,N,N',N'-tetra(naphthalen-2-yl)biphenyl-4,4'-diamine;[1,1'-biphenyl]-4,4'-diamine, N4,N4,N4',N4'-tetra-2-naphthalenyl-;[1,1'-biphenyl]-4,4'-diamine, N4,N4,N4',N4'-tetra-2-naphthalenyl-;
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