1-Hydroxy didesmethyl Sibutramine

1-Hydroxy didesmethyl Sibutramine is a demethylated and hydroxylated metabolite of Sibutramine, characterized by a 3,4-dichlorobenzylamine scaffold with a hydroxyl group at the α-position of the side chain and loss of two methoxy substituents on the aromatic ring. The structural modifications include a tertiary amine center and reduced aromatic electron density compared to the parent compound. This impurity forms via sequential O-demethylation and α-hydroxylation during metabolic or oxidative degradation pathways. It functions as an HPLC reference standard for quantifying process-related impurities in Sibutramine drug substance analysis.