1,1-Difluoro-2-chloroethylene359-10-4100 % similar 1-Fluoro-1,2-dichloroethylene430-58-044 % similar 2-Bromo-1,1-difluoroethene359-08-041 % similar Trichloroethylene79-01-635 % similar 1,2-Dichloropropylene563-54-230 % similar