2-[[2-[[2-[[2-[[2-(2,6-diaminohexanoylamino)-5-(diaminomethylideneamino)pentanoyl]amino]-3-hydroxybutanoyl]amino]-4-methylpentanoyl]amino]-5-(diaminomethylideneamino)pentanoyl]amino]-5-(diaminomethylideneamino)pentanoic acid; Lys-Arg-Thr-Leu-Arg-Arg trifluoroacetate salt