| http://www.w3.org/ns/prov#value | - nclude methyl, ethyl, propyl, i-propyl, butyl and tert-butyl.Of these, methyl and tert-butyl are preferable.As the aryl group shown by R.sup.1 to R.sup.4, phenyl, naphthyl or the like can be given, for example.As the substituent, a halogen such as a fluorine atom, a trifluoromethyl group and a cyano group can be given.
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