| http://www.w3.org/ns/prov#value | - Protecting groups that can be used include 1) alkyl esters such as methyl, trimethylsilyl and tert-butyl; 2) arylalkyl esters such as benzyl and substituted benzyl; or 3) esters that can be cleaved by a mild base or mild reductive means such as trichloroethyl and phenacyl esters.
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