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a Reaction conditions and yields as indicated. tert-Butyldimethylsilyl, TBS; N,N-diisopropylethylamine, DIPEA; trifluoroacetic anhydride, TFAA; 4-(dimethylamino)pyridine, DMAP; trifluoroacetyl, Tfa; 2-(4-nitrophenyl)ethyl, Npe; diisopropyl azodicarboxylate, DIAD; tetrabutylammonium fluoride, TBAF; 4,4′-dimethoxytrityl, DMT; tert-butyldimethylsilyl trifluoromethanesulfonate, TBS-Tf; 2-cyanoethyl-N,N-diisopropylchlorophosphoramidite, CEP-Cl.
