2,3,5,6-Tetrachloro-4-(pentachlorophenoxy)phenol 21567-21-5 4-06-00-05776 (Beilstein Handbook Reference) 4-Hydroxy-nonachlorodiphenyl ether 4-Hydroxynonachlorodiphenyl ether BRN 2313237 Nonachloro-4-phenoxyphenol Phenol, 2,3,5,6-tetrachloro-4-(pentachlorophenoxy)-