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Chemical structure of thiol precursors. (a) 3-S-glutathionyl mercaptohexan-1-ol (GSH-3MH), (b) 3-S-glutathionyl mercapto-4-methyl-pentan-2-one (GSH-4MMP), (c) 3-S-cysteinyl mercaptohexan-1-ol (Cys-3MH), and (d) 3-S-cysteinyl mercapto-4-methyl-pentan-2-one (Cys-4MMP).
