| http://www.w3.org/ns/prov#value | - The secondary or tertiary monovalent hydrocarbon group is, for example, preferably a secondary or tertiary alkyl group of the formula (I)-d ##STR7## wherein R15 is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, R16 is a hydrogen atom, a phenyl group or an alkyl group having 1 to 5 carbon atoms, and R17 is the same as or different from R15 and has the same definition as R15, provided
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