Olopatadine related compound B

Olopatadine related compound B is a synthetically derived impurity arising from partial oxidation during the alkylation step in olopatadine synthesis. It retains the core piperidine-pyridine scaffold but features a hydroxyl-substituted propyl linker in lieu of the parent drug’s acetylated amine. The molecule exhibits a conjugated aromatic system with a meta-oriented nitro group, conferring distinct UV absorption characteristics. Its primary application is as an HPLC reference standard for quantifying process-related impurities in olopatadine APIs.