Moveltipril calcium (MC-838 calcium) is an orally active angiotensin converting enzyme (ACE) inhibitor with antihypertensive activity. Moveltipril calcium binds via a stable thioester bond and exhibits relative resistance to enzymatic hydrolysis in rat liver homogenate. Moveltipril calcium effectively inhibits ACE extracted from rabbit lung in a concentration-dependent manner. Moveltipril calcium is able to highly specifically inhibit the contractile response to angiotensin-I (AI) in free rat aortic rings and guinea pig ileum preparations, while enhancing the contractile response to calcitonin.