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n4google.
isaphttp://webisa.webdatacommons.org/prov/
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wherein X represents a halogen atom, SbF6, AsF6, PF6, BF4 or BPh4, and R1 to R4 are the same or different, and are an optionally substituted alkyl group, an optionally substituted aryl group, an optionally substituted aralkyl group, an optionally substituted diarylmethyl group or a group represented by the following formula (II):
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n4:com
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isa:89908653