Ethyl 4-(2-(tert-Butoxy)-2-oxoethoxy)-3-oxobutanoate is an intermediate for the synthesis of O-Des[2-aminoethyl]-O-carboxymethyl dehydroamlodipine (D289480), which is the metablolite of Amlodipine (A633495), a long-acting calcium channel blocker that is commonly used as an anti-hypertensive in the treatment of cardiovascular conditions.