90331-82-1 L-Leucine, N-(N2-(4-nitro-N-(N-(N-(N-L-prolyl-L-threonyl)-L-alpha-glutamyl)-L-phenylalanyl)-L-phenylalanyl)-L-arginyl)-, (2'E)- Pro-thr-glu-phe-4-nitro-phe-arg-leu Prolyl-threonyl-glutamyl-phenylalanyl-4-nitrophenylalanyl-arginyl-leucine Ptgp-NP-AL