| http://www.w3.org/ns/prov#value | - in which R' is alkyl, alkaryl, aralkyl or aryl (preferably having up to 20 and in particular up to 12 carbon atoms), the radicals X are identical to or different from one another and are OH or hydrolyzable groups, and m is 0 or 1, additionally being added to the system at any moment after stage (a) and before stage (c).
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