5,5′-Dithiobis(2-nitrobenzoic acid)

5,5'-Dithiobis(2-nitrobenzoic acid), also known as Ellman's reagent (CAS 69-78-3), is a pharmaceutical-grade specialized reagent manufactured directly by LEAP CHEM CO., LTD., certified to USP standard, described by the supplier as a high-quality fine chemical, intermediate and API offering. It is distributed to the Eastern European market.