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(2S)-2-Fmoc-amino-3-(5′-deoxyuridinylamino)-3-oxopropyloxyacetic acid was synthesized from l-serine as a monomer for preparing the second-generation peptide ribonucleic acid with an oxa-peptide backbone (oxa-PRNA). The ether linkage was incorporated to improve the modest solubility in aqueous solution of the original PRNA with an iso-glutamine backbone, without harming the ability of the amino-uridine...