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This file assembles the verified identity numbers - registry identifiers, formula, exact masses and adduct values cross-checked against PubChem - and then works through the failure modes specific to this molecule: the degradation route that a standard purity line can miss, a mass-spectrometry coincidence that can fool a low-resolution identity check, an assay method still in common use that cannot distinguish glutathione from its own breakdown products, salt-versus-free-acid label arithmetic worked to the milligram, and the documented contamination record that makes one particular certificate line non-negotiable for this compound above all others