(S)-1-((R)-2-amino-3-phenylpropanoyl)-N-((S)-5-guanidino-1-((4-nitrophenyl)amino)-1-oxopentan-2-yl)piperidine-2-carboxamide triacetate; L-Argininamide, D-phenylalanyl-(2S)-2-piperidinecarbonyl-N-(4-nitrophenyl)-triacetate; H-D-Phe-Homopro-Arg-pNA.2 Acetate