2,2′-Dipyridyl disulfide

2,2′-Dipyridyl disulfide (Aldrithiol 2) is a useful reagent for the determination of sulfhydryl groups. It acts as a peptide coupling reagent and as an oxidizing agent. 2,2′-Dipyridyl disulfide (Aldrithiol 2) is also used for the activation of glycosides.