| http://www.w3.org/ns/prov#value | - Here, in the formula, Rf is a C1-12 perfluoroalkyl group, A is a nitrogen atom or a phosphorus atom, B is at least one member selected from the group consisting of BF4, PF6, Cl, CF3SO3, AsF6, N(SO2CF3)2, NO3, ClO4, Br and I, x is an integer of from 1 to 4, and n is an integer of from 1 to 10.
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