Methyl 2-(3 | 5-dichloro-4-hydroxybenzamido)benzenesulfonate is a process-related impurity typically generated via inadvertent esterification or methylation of a benzenesulfonic acid intermediate during methanol workup. It is chromophoric and amenable to characterization by reversed-phase HPLC with photodiode array detection and by LC-MS | where diagnostic fragments confirm the substituted dichloro aromatic pattern. Proton NMR reveals a methyl sulfonate resonance and aromatic signals consistent with 3 | 5-dichloro-4-hydroxy substitution. This impurity can influence final product purity | solubility and stability | therefore control strategies include optimized stoichiometry | minimized methanol exposure and targeted purification to meet ICH impurity thresholds.
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