Sulfo-NHS-SS-Biotin. A water-soluble biotinylating reagent, Synonyms:-Sulfosuccinimidyl-2-(biotinamido)-ethyl-1,3'-dithiopropionate; Biotin disulfide N-Hydroxysulfosuccinimide ester, CAS Number:-325143-98-4, Molecular Formula:-C19H2GO9NGSGNa, Purity:-G80% by NMR, 50mg.