4,4'-(2,2,3,3,3-pentafluoropropane-1,1-diyl)diphenol InChI=1/C15H11F5O2/c16-14(17,15(18,19)20)13(9-1-5-11(21)6-2-9)10-3-7-12(22)8-4-10/h1-8,13,21-22 phenol, 4,4'-(pentafluoropropylidene)bis-