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2,2',7,7'-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene
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[4-(3,6-dimethyl-9-hydro-carbazole-9-yl)butyl]phosphonic acid
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[2-(3,6-Dimethoxy-9H-carbazol-9-yl)ethyl]phosphonic Acid
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(2-(9H-carbazol-9-yl)ethyl)phosphonic acid