1940-20-1 3,4,4',5',6,6'-Hexachloro-2,2'-methylenediphenol Phenol, 2,3,4-trichloro-6-((2,3,5-trichloro-6-hydroxyphenyl)methyl)- Phenol, 3,4,4',5',6,6'-hexachloro-2,2'-methylenedi-