H-Pro-Arg-OH

prolylarginine

(2S)-5-guanidino-2-[[(2S)-pyrrolidine-2-carbonyl]amino]valeric acid

(2S)-5-(diaminomethylideneamino)-2-[[(2S)-pyrrolidine-2-carbonyl]amino]pentanoic acid

(2S)-5-[bis(azanyl)methylideneamino]-2-[[(2S)-pyrrolidin-2-yl]carbonylamino]pentanoic acid