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Synthesis of multivalent scaffold 27. Reagents and conditions: [a] 0.1 % TFA in H2O/CH3CN (1:1), 37 °C, 30 min, 75 %; [b] NaIO4 (20 equiv), H2O, r.t., 40 min, 70 %; [c] 0.1 % TFA in H2O/CH3CN (1:1), 37 °C, 30 min, 85 %; [d] NaIO4 (80 equiv), H2O, r.t., 40 min, 78 %.
