NNCtBu;4,4'-di-tert-butyl-6-phenyl-2,2'-bipyridine;6-phenyl-4,4'-bis(tert-butyl)-2,2'-bipyridine;tBu(C5H3N)(tBu(C5H2N))(C6H5);4,4'-Di-tert-butyl-6-phenyl-[2,2']bipyridinyl;
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