Lisinopril (CAS 76547-98-3) is a high-purity ACE inhibitor API with a targeted cardiovascular regulatory mechanism. It blocks the conversion of angiotensin I to angiotensin II, dilating blood vessels and reducing peripheral vascular resistance to lower blood pressure, while also protecting cardiac and renal function in patients with hypertension and heart failure. Its refined crystalline form ensures consistent bioactivity and low impurity profiles, making it a reliable active ingredient for cardiovascular pharmaceutical R&D.