| http://www.w3.org/ns/prov#value | - or biologically acceptable salts or pro-reporter molecules (such as methyl ester form of carboxyl-containing amino acid residues) thereof, wherein R1 is an N-terminal protecting group such as t-butyloxycarbonyl, acyl, and benzyloxycarbonyl; each AA independently is a residue of any natural or non-natural ??-amino acid or ??-amino acid, or derivatives of an ??-amino acid or ??-amino acid; each n is
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