655231-79-1 Oxirane,2,2'-(4,4,6,6,7,7,9,9,10,10,12,12,13,13,15,15-hexadecafluoro-2,5,8,11,14,17-hexaoxaoctadecane-1,18-diyl)bis- 39617-48-6 1,1,1,2,4,4,5,7,7,8,10,10,11,13,13,14,16,16,17,17,18,18,18-TRICOSAFLUORO-5,8,11,14-TETRAKIS(TRIFLUOROMETHYL)-3,6,9,12,15-PENTAOXAOCTADECANE