| http://www.w3.org/ns/prov#value | - #STR8## wherein n' is an integer of 0 or 1; p is 0 or more; R1 to R5, which may be the same or different, each is a group selected form the group consisting of an alkyl group, an alkoxyl group, an unsubstituted phenyl group, a phenyl group substituted by halogen, an alkyl group, an alkoxyl group or an acyl group, an unsubstituted phenoxyl group, a phenoxyl group substituted by halogen, an alkyl
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