| http://www.w3.org/ns/prov#value | - However, it is required that at least one of the R.sup.7 and R.sup.8 is the halogenated hydrocarbongroup having 1 to 20 carbon atoms.Specific examples of the afore-mentioned hydrocarbon group having 1 to 20 carbon atoms may include alkyl groups such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, n-hexyl, cyclopropyl, cyclopentyl, cyclohexylor methylcyclohexyl;
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