Ledipasvir impurity 7

Ledipasvir Impurity 7 is a synthetic byproduct arising from incomplete alkylation during the final stages of Ledipasvir synthesis. It retains the core pyridine and tetrahydropyridine moieties but lacks the C-terminal methyl ester, featuring instead a free carboxylic acid group. This structural modification disrupts NS5A binding affinity. It serves as an HPLC reference standard for quantifying process-related impurities in Ledipasvir drug substance analysis.