97453-39-9 L-Isoleucine, N-(1-(N-(1-(N-(1-L-tyrosyl-L-prolyl)glycyl)-L-prolyl)-L-phenylalanyl)-L-prolyl)- Tyr-pro-gly-pro-phe-pro-ile Tyrosyl-prolyl-glycyl-prolyl-phenylalanyl-prolyl-isoleucine beta-Casomorphin I