2-((2',4'-Difluoro(1,1'-biphenyl)-4-yl)oxy)-2-methylpropanoic acid 2-(2'',4''-Difluordiphenyl-4'-yloxy)-2-methylpropionsaeure [German] 79781-89-8 Propanoic acid, 2-((2',4'-difluoro(1,1'-biphenyl)-4-yl)oxy)-2-methyl-