| http://www.w3.org/ns/prov#value | - [0856] wherein R???, R??? and R?????? may be the same or different and are each a fluorine atom or a phenyl group which may have a substituent such as a fluorine atom, a methyl group or a trifluoromethyl group. [0857] Examples of compounds represented by the formula (18) include trifluoroboron, triphenylboron, tris(4-fluorophenyl)boron, tris(3,5-difluorophenyl)boron, tris(4-fluoromethylphenyl)boro
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