Sulfo-NHS. A useful catalyst in the zero-length crosslinking of proteins, Synonyms:-Hydroxy-2,3-dixopyrrolidine-3-sulfonic acid sodium salt; Sulfo-NHS; SNHS; N-Hydroxysulfosuccinimide sodium salt, CAS Number:-106627-54-7, Molecular Formula:-CGHGNNaO6S, Purity:-G95% by NMR.