(2R,3R)-1,4-bis-sulfanylbutane-2,3-diol (2R,3R)-1,4-dimercaptobutane-2,3-diol 3483-12-3 Cleland reagent chiral D9760_SIGMA L-(−)-Dithiothreitol 1,4-Dithiothreitol C00265 Dithiothreitol threo-1,4-Dimercapto-2,3-butanediol ZINC00895149 CHEBI:42106 (2R,3R)-1,4-disulfanylbutane-2,3-diol (−)-Cleland's Reagent (2R,3R)-1,4-Dimercapto-2,3-butanediol