Assertion: polypeptide's monomer | /r/HasProperty | converted into reactive monomer
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text: This protected monomer is converted into a reactive monomer that can be incorporated into a peptide chain by, for example, replacement of the benzyl ester with the p-nitrophenyl ester, for example by effectively exchanging with p-nitrophenyl trifluoroacetate or bis-(p-nitrophenyl)carbonate, and removal of the Boc protecting group.