Azelnidipine des nitro impurity

Azelnidipine des nitro impurity is a structurally related degradation byproduct of the antihypertensive agent Azelnidipine, characterized by the absence of a nitro functional group from the parent compound’s aromatic substituent. This impurity retains the dihydropyridine core and vinylphenyl ether linkage but features a hydrogenated aromatic ring system in place of the nitro-containing moiety. Its formation likely occurs via reductive pathways during synthesis or storage. This compound functions as an HPLC reference standard for monitoring nitro-group stability in Azelnidipine drug substance analysis.