| http://www.w3.org/ns/prov#value | - For synthesis of the release tag compounds of the preferred embodiments of the invention, where the release group consists of an olefin, glycol, ??-hydroxyketo, or ??-hydroxyketo compounds, this functionality is established either before or after incorporation of the release group precursor into a release tag, by reactions such as oxidation, addition (both nucleophilic and electrophilic addition o
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