Salbutamol EP Impurity O

Salbutamol EP Impurity O is a structurally related oxidation byproduct derived from the parent compound, featuring a carbonyl group (C=O) formed via oxidative cleavage of the hydroxymethyl side chain. This impurity retains the 1,3-benzodioxole aromatic core and 4-hydroxyphenyl substitution but exhibits altered electronic properties due to the ketone functionality. The compound arises during synthetic pathways under oxidative stress conditions, leading to side-chain modification. It serves as a critical HPLC reference standard for quantifying oxidative degradation in Salbutamol drug substance stability testing.