1,2-Dichloro-1,2,3,3,4,4-hexafluorocyclobutane 1,2-Dichlorohexafluorocyclobutane 1,2-Dichloroperfluorocyclobutane 356-18-3 BRN 1909267 CYCLOBUTANE, 1,2-DICHLOROHEXAFLUORO- Cyclobutane, 1,2-dichloro-1,2,3,3,4,4-hexafluoro- (9CI) EINECS 206-599-7