1,2,3,4,5,6,7,8-octafluoro-9-hydroxy-9-[2,4-bis(trifluoromethyl) phenyl]fluorene
1,2,3,4,5,6,7, 8-octafluoro-9-hydroxy-9-nonafluorodiphenylfluorene
1,2,3,4,5,6,7,8-octafluoro-9-hydroxy-9-(3,5-trifluoromethylphenyl)fluorene
1,2,3,4,5,6,7,8-octafluoro-9-hydroxy-9-pentafluorophenylfluorene