Trandolaprilate-d6 is the deuterium labeled Trandolaprilate[1]. Trandolaprilate is a potent angiotensin-converting enzyme (ACE) inhibitor. Trandolaprilate partially inhibits angiotensin-I-mediated c-fos induction. Trandolaprilate is main bioactive metabolite of Trandolapril. Trandolaprilate shows high lipophilicity[2][3].