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Losartan Carboxylic Acid (E-3174) a potent AT1 antagonist (Kis: 0.57 nM, rat; 0.67 nM, human), producing a depressor response and vasodilatation. Losartan Carboxylic Acid , a metabolite of losartan, is more potent than losartan in blocking the angiotensin II-induced responses in vascular smooth muscle cells.