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The Cu+‐catalyzed Huisgen [3+2] cycloaddition has been used to elaborate analogues of a candidate PARACEST MRI contrast agent, which is a complex of Eu3+ with DOTAM–Gly–Phe–OH. Analogues possessing either one L‐tyrosine in place of an L‐phenylalanine, or with all four phenylalanine units replaced, were transformed into Tyr(O‐propargyl) substrates for “click” chemistry. Conjugation of the Eu3+–DOTAM...
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