Zavegepant Impurity Unknown C

Zavegepant Impurity Unknown C is a synthetically derived byproduct arising from an alternative oxidation pathway during the final stages of Zavegepant synthesis. It retains the core pyrazine-piperidine scaffold but features an exocyclic methylene group in lieu of the parent compound's carbonyl oxygen. This structural deviation results from a competing nucleophilic substitution event at the C-5 position of the bicyclic framework. Functions as a critical HPLC reference standard for quantifying process-related impurities in active pharmaceutical ingredient batches.