CL-242817 is an orally available angiotensin converting enzyme ( ACE ) inhibitor. CL-242817 inhibits the conversion of angiotensin I to angiotensin II and has blood pressure lowering activity. CL-242817 can also improve Monocrotaline induced lung injury. CL-242817 can be used in the study of pulmonary fibrosis and hypertension-related diseases.