2-(Chloromethyl)-6-methoxy-4-methylpyridine-D3 is a deuterium labelled analogue of 2-(Chloromethyl)-6-methoxy-4-methylpyridine (C587835), which is a trisubstituted Pyridine based building block. Pyridine (P991280) is a heterocyclic ring base present in many biologically active compounds like the vitamins niacin and pyridoxal. Pyridine is used in dehalogenation reactions and can be used as a base in condensation reactions.