N-Protected, conformationally constrained, eight-membered ring containing cyclic dipeptides derived from methyl cyclo-[(R)-cysteinyl-(R)-penicillamine] contain a cis amide bond, whilst the corresponding peptides derved from cyclo-[(R)-cysteinyl-(S)-penicillamine] contain a trans amide bond.
S. Cumberbatch, M. North and G. Zagotto, J. Chem. Soc., Chem. Commun., 1993, 641 DOI: 10.1039/C39930000641
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