prov:value
| - In the above process, R1 is an amino acid side chain or a functionalized amino acid side chain; R2 is a protecting group; R3 is a functional group including, but not limited to, hydrogen, alkyl, cycloalkyl, aryl and ???NHP, wherein P is selected from the group consisting of H, alkyl, cycloalkyl, aryl and a protecting group; R4 is a functional group including, but not limited to, alkyl, cycloalkyl
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