129276-56-8 L-Aspartic acid, N-(N-(N-(N-(5-oxo-L-prolyl)-L-alpha-glutamyl)glycyl)-L-seryl)- N-(N-(N-(N-(5-Oxo-L-prolyl)-L-alpha-glutamyl)glycyl)-L-seryl)-L-aspartic acid Pyro-glutamyl-glutamyl-glycyl-seryl-aspartic acid Pyroglu-glu-gly-ser-asp