Nicardipine bis analog

Nicardipine bis analog is a dimeric dihydropyridine derivative featuring two pyridine-substituted ester moieties linked via a methylene bridge. Its structure incorporates a 1,4-dihydropyridine core with bis(4-methyl-2-pyridyl) substituents at the 3- and 5-positions, forming a symmetrical biphenyl-like scaffold. This compound arises as a synthetic byproduct during the coupling of nicardipine precursors, characterized by enhanced steric bulk and altered lipophilicity compared to the parent drug. It serves as an HPLC reference standard for quantifying process-related impurities in nicardipine APIs.