Abstract
Reaction of cyclo -(Gly- L -Cys-Gly) 3 with 1,3,5- tris -bromomethylbenzene yields a tris thioether of the cyclic nonapeptide in 28% yield. Both 1H and 13C NMR spectra are consistent with a molecule of 3-fold symmetry; the temperature dependences of chemical shifts of the amide hydrogens are consistent with a structure composed of three β-turns.
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