Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013 by IUPAC (source code)

= Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013 by IUPAC
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https://iupac.qmul.ac.uk/BlueBook/P10.html

Official Blue Book, peptide nomenclature: paragraph defining homodetic cyclic peptides (ring entirely of amino-acid residues linked by eupeptide bonds), followed by heterodetic cyclic peptides. Cite the cyclic-peptide paragraph rather than infer that all rings are head-to-tail.

Additional nomenclature locators: https://iupac.qmul.ac.uk/BlueBook/P6.html[Section P-65.1.7.2.1] and https://iupac.qmul.ac.uk/BlueBook/Papp2.html[Appendix 2, formyl terminology].