benzyl ((2S)-1-((1-((S)-2-((2-amino-2-oxoethyl)carbamoyl)pyrrolidin-1-yl)-5-(3-nitroguanidino)-1-oxopentan-2-yl)amino)-4-methyl-1-oxopentan-2-yl)carbamate

L-Tryptophyl-L-seryl-L-tyrosylglycine Methyl Ester Hydrochloride

L-Pyroglutamyl-L-histidyl-L-tryptophyl-L-seryl-L-tyrosylglycine Hydrazine