[5-[(3aS,4S,6aR)-Hexahydro-2-oxo-1H-thieno[3,4-d]imidazol-4-yl]-1-oxopentyl]-3-(2-pyridinyldithio)-L-alanine is a biotinylated reagent possessing a pyridyl disulfide group that can react with thiol groups of proteins over a wide range of pH level.
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