Salbutamol Imp. H

Salbutamol Imp. H is a structurally related impurity derived from the synthetic pathway of salbutamol, characterized by a substituted phenethylamine backbone with a tertiary amine and hydroxyl group. Its core structure incorporates a benzene ring appended with a methoxy group at the para position and a branched aliphatic side chain bearing a secondary hydroxyl moiety. The compound arises as a byproduct during catalytic hydrogenation steps, featuring a reduced double bond compared to the parent API. This impurity serves as a critical HPLC reference standard for quantifying process-derived impurities in salbutamol drug substance batches.