Synonyms: Atrialnatriuretic peptide-27 (Anguilla japonica) (9CI); Atriopeptin-21 (rat),N-[N-(N2-L-seryl-L-lysyl)-L-seryl]-2a-endo-L-proline-7-L-lysine-8-L-leucine-13-L-serine-14-L-tyrosine-21a-L-arginine-21b-L-lysine-;1,2-Dithia-5,8,11,14,17,20,23,26,29,32,35,38,41,44,47,50-hexadecaazacyclotripentacontane,cyclic peptide deriv.; Atriopeptin-27 (Anguilla japonica); Eel atrialnatriuretic peptide