Letizia Barbieri

There is an error in the structure of compound 7 shown in Scheme 4. The C(CF3)3 group was incorrectly depicted as being linked via a methylene spacer to the oxygen atom, whereas it should be directly attached. The corrected structure and corresponding synthetic procedure are now provided below. These corrections do not affect the conclusions or overall findings of the paper. The authors apologize for any inconvenience caused. Scheme 4 Scheme 4.

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The synthesis of specifically isotope labelled Fluorotryptophan and its use in mammalian cell-based protein expression for 19F-NMR applications 19F nuclei serve as versatile sensors for detecting protein interactions and dynamics in biomolecular NMR spectroscopy. Although various methods have been developed to incorporate fluorine-containing aromatic residues into proteins using E.