prov:value
| - In this formula, E is aluminum, gallium, or indium, F is fluorine, each R1 is, independently, a perfluorinated polycyclic fused ring group in which the ring system is totally aromatic (e.g., as in naphthyl or anthracenyl), or is partially aromatic and partially cycloaliphatic, (e.g., as in tetrahydronaphthyl, acenaphthyl, indenyl, or fluorenyl), each R2 is a pentafluorophenyl group, and n is 1 to
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