3-Hydroxymethyl Meclofenamic Acid-D4 (CAS 1189663-45-3) is an isotopically labeled degradation impurity of meclofenamic acid characterized by deuterium substitution at the hydroxymethyl moiety. Relevant for impurity profiling and stability studies, this compound serves as a mass spectrometry internal standard to track formation pathways, retention time shifts, and isotopic patterns in LC-MS/MS assays. Analytical attributes include defined exact mass, predictable fragmentation, and distinctive 1H and 13C NMR shifts due to deuteration. Use enables accurate quantification of trace-level process impurities, qualification under ICH Q3A and Q3B, and robust method validation for impurity control and regulatory submissions.
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