7,7,8-Tribromo-1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorooctane, 2,2-Dibromo-2-(perfluorohex-1-yl)ethyl bromide, 2-(perfluorohex-1-yl)-1,2,2-tribromoethane [ 59665-25-7 ]