(S)-N-(1-(2-Methyl-1-oxo-3-((1-oxopropyl)thio)propyl)-L-prolyl)-L-phenylalanine 1-(D-3-Propanoylthio-2-methylpropanoyl)-L-prolyl-L-phenylalanine 74259-02-2 L-Phenylalanine, N-(1-(2-methyl-1-oxo-3-((1-oxopropyl)thio)propyl)-L-prolyl)-, (S)-