4,4'-(Hexafluoroisopropylidene)diphthalic anhydride5,5'-(1,1,1,3,3,3-Hexafluoropropane-2,2-diyl)bis(2-benzofuran-1,3-dione)4,4'-(Hexafluoroisopropylidene)diphthalic anhydride2,2-Bis(1,3-dihydro-1,3-dioxobenzo[c]furan-5-yl)hexafluoropropane 99%4,4′-(Hexafluoroisopropylidene)diphthalic anhydride4,4-六氟异丙基 邻苯二甲酸酐4,4′-(六氟异丙烯)二酞酸酐4,4'-(Hexafluoroisopropylidene)diphthalic anhydride