The binding of N-trifluoroacetyl-D-tryptophan by chymotrypsin causes a downfield shift in the 19F n.m.r. signal in the pH range 6·33–8·12 and that of N-trifluoroacetyl-D-phenylalanine and of N-trifluoroacetyl-L-tryptophan causes a downfield shift at pH 6·34.
H. Ashton and B. Capon, J. Chem. Soc. D, 1971, 513 DOI: 10.1039/C29710000513
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