The molecule is a peptide cation obtained by deprotonation of the carboxy group and protonation of the primary amino and guanidino groups of [des-Phe(8), des-Arg(9)]-bradykinin. It is the major species at pH 7.3. It is a conjugate acid of a [des-Phe(8), des-Arg(9)]-bradykinin.
(2S)-1-[(2S)-2-[[(2S)-2-[[2-[[(2S)-1-[(2S)-1-[(2S)-2-azaniumyl-5-(diaminomethylideneazaniumyl)pentanoyl]pyrrolidine-2-carbonyl]pyrrolidine-2-carbonyl]amino]acetyl]amino]-3-phenylpropanoyl]amino]-3-hydroxypropanoyl]pyrrolidine-2-carboxylate