| http://www.w3.org/ns/prov#value | - oxy or toluenesulfonyloxy group, andl.sub.2 is a number of 2, 3 or 4, ##STR138## wherein R.sup.6 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an alkoxyalkyl group resulting from substitution of an alkyl group having 2 to 4 carbon atoms by an alkoxy group having1 to 4 carbon atoms, R.sup.7 and R.sup.8 are identical or different and each represents a hydrogen atom or an
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