1,2-Difluoro-1-chloroethylene 1-Chloro-1,2-difluoroethylene 359-04-6 BRN 1840020 EINECS 206-622-0 ETHYLENE, 1-CHLORO-1,2-DIFLUORO- Ethene, 1-chloro-1,2-difluoro- F 1122a HCFC 1122a