| http://www.w3.org/ns/prov#value | - be used include: (1) alkyl esters such as methyl and t-butyl, (2) aryl esters such as benzyl and substituted benzyl, or (3) esters which can be cleaved by mild base treatment or mild reductive means such as trichloroethyl and phenacyl esters. [0104] The ??-amino group of each amino acid must be protected.
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