98813-21-9 Cys-glu-asn-pro-ser-gln-phe-tyr-glu-asp-leu Cysteinyl-glutamyl-asparaginyl-prolyl-serinyl-glutaminyl-phenylalanyl-tyrosyl-glutamyl-aspartyl-leucine L-Leucine, N-(N-(N-(N-(N-(N2-(N-(1-(N2-(N-L-cysteinyl-L-alpha-glutamyl)-L-asparginyl)-L-prolyl)-L-seryl)-L-glutaminyl)-L-phenylalanyl)-L-tyrosyl)-L-alpha-glutamyl)-L-alpha-aspartyl)- Synthetic peptide Sp-23