N-(2-Chloro-2-methylpropyl)-N-(3,3-diphenylpropyl)-N-methylamine-d5 is the isotope labelled analog of N-(2-Chloro-2-methylpropyl)-N-(3,3-diphenylpropyl)-N-methylamine (C369905); a useful synthetic intermediate in the synthesis of Lercanidipine (L179000) which is a dihydropyridine calcium channel blocker. Also antihypertensive.