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HPLC traces of the final reaction mixtures of a + b + c + d (each at 4 mM) with 1 + 2 + 3 (each at 0.4 mM) and NaBH3CN (1.2 mM) in aqueous phosphate (20 mM, pH 6). (A) Trace corresponds to the reaction without additive. (B) Trace corresponds to the reaction in the presence of 1 equivalent (0.4 mM) of CA.
