Peptides that contain a circular structure, typically formed by a peptide bond between the N- and C-termini.
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ETHYL 3,5-DIAMINOBENZOATE
Boc-Phe-Pro-Gly-Gly-Cys(Acm)-NHMe
4-iodo-3-nitrobenzaldehyde
N~5~-(diaminomethylidene)-N~2~-methyl-D-ornithyl-N-{(2S)-4-amino-1-carboxy-4-formyl-5-[(E)-iminomethyl]-3,7-dioxo-7-phenylheptan-2-yl}glycinamide
