Saralasin TFA ([Sar1,Ala8] Angiotensin II) is a synthetic octapeptide analog of angiotensin II, functioning as a competitive antagonist at angiotensin II receptors with a K i value of 0.32 nM for 74% of its binding sites, while also exhibiting partial agonist activity. It is utilized in the study of renovascular and renin-dependent (angiotensinogenic) hypertension [1] [3] [6].