Azelnidipine bezhydril amine

Azelnidipine bezhydril amine is a process-related impurity arising from the substitution of a benzhydryl amine moiety in place of the methoxyphenyl side chain of the parent dihydropyridine calcium channel blocker. The compound retains the 1,4-dihydropyridine core and 2-ethyl-5-methyl substituents but features a diphenylmethylamine group conjugated to the pyridine nitrogen, introducing steric and electronic deviations from the parent drug. This structural divergence disrupts the pharmacophore's optimal conformation, rendering it inactive. This compound serves as an HPLC reference standard for quantifying synthetic byproduct levels in Azelnidipine active pharmaceutical ingredient batches.