The molecule is a peptide zwitterion that is the dizwitterionic form of angiotensin (1-9) having both carboxy groups deprotonated and the aspartyl amino group and arginine side-chain protonated. It is the major species at pH 7.3. It has a role as a human metabolite, an antihypertensive agent, a cardioprotective agent and a rat metabolite. It is a tautomer of an angiotensin (1-9).
(3S)-3-azaniumyl-4-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S,3S)-1-[[(2S)-1-[(2S)-2-[[(2S)-1-[[(1S)-1-carboxylato-2-(1H-imidazol-5-yl)ethyl]amino]-1-oxo-3-phenylpropan-2-yl]carbamoyl]pyrrolidin-1-yl]-3-(1H-imidazol-5-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]amino]-3-(4-hydroxyphenyl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxobutan-2-yl]amino]-5-(diaminomethylideneazaniumyl)-1-oxopentan-2-yl]amino]-4-oxobutanoate