Used as an intermediate in the synthesis of proton pump inhibitors (PPIs), particularly omeprazole and related drugs. It plays a key role in forming the pyridine core structure required for the biological activity of these anti-ulcer medications. The chloromethyl group allows for further alkylation or coupling reactions, enabling the attachment of benzimidazole moieties in the final drug molecule. Widely utilized in pharmaceutical manufacturing due to its reactivity and stability in controlled conditions.