4 4'-dimethyl-2 2'-bipyridine July 8, 2019 16 32 64 128 4 4'-dimethyl-2 2'-bipyridyl 4 4′-bis(1 1-dimethylethyl)-2 2′-bipyridine 4 4'-di-tert-butyl-2 2'-bipyridine 2 4-dimethylpyrrole
