Peptide Conformations. 15. One- and Two-Dimensional 1H, 13C, and 15N NMR Studies of cyclo(Pro-Phe-Gly-Phe-Gly)n (n = 1,2): Selective Complexation of Lithium Ions (n = 1) and Potassium Ions (n = 2)

Article abstract of DOI:10.1021/ja00381a006

The cyclic pentapeptide cyclo(Pro-Phe-Gly-Phe-Gly) (1), the cyclic decapeptide with dimer sequence 2, and four specifically deuterated derivatives were synthesized and studied by NMR spectroscopy.Two-dimensional correlation techniques, such as SECSY spect