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<p><chem display=block>RS-SR + 2 Na -> 2 NaSR,</chem> followed by protonation of the resulting metal thiolate: <chem display=block>NaSR + HCl -> HSR + NaCl</chem>In biochemistry labwork, thiols such as ?-<a href="page.php?w=mercaptoethanol">mercaptoethanol</a> (?-ME) or <a href="page.php?w=dithiothreitol">dithiothreitol</a> (DTT) serve as reductants through thiol-disulfide exchange. The thiol reagents are used in excess to drive the equilibrium to the right: <chem display="block">RS-SR + 2 HOCH2CH2SH <=> HOCH2CH2S-SCH2CH2OH + 2 RSH</=></chem>The</p><p>
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