. "(S)-2-((S)-2-{(S)-2-[(S)-2-((S)-4-Carboxy-2-{(2S,3R)-3-hydroxy-2-[((S)-pyrrolidine-2-carbonyl)-amino]-butyrylamino}-butyrylamino)-3-phenyl-propylamino]-3-phenyl-propionylamino}-5-guanidino-pentanoylamino)-pentanedioic acid" . "H-256" . . . .