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2'/3'-O-[Bz(NO2)-Orn(Boc)]-5'-O-Piv-Ado (1) and its deoxy analog: 3'-O-[Bz(NO2)-Orn(Boc)]-5'-O-Piv-2'- dAdo (2) were designed and synthesized as substrates for the model ribosome reaction we used to demonstrate the crucial role of A76 2'-OH of peptidyl-tRNA in the rate acceleration of peptide bond formation during protein biosynthesis.