C. I. Reactive brown 47 is a chemical compound registered under CAS number 96293-54-8, with the molecular formula C76H44 Cr N20 O22 S4 . 5 Na and a molecular weight of about 1884.49 g/mol. It is also known as Pyridinium,3-carboxy-1-[4-[[6-[(2-carboxyphenyl)azo]-5-hyd. SixChem supplies C. I. Reactive brown 47 for laboratory research and bulk production; product code 279967. Send an inquiry for purity, packaging, price and lead time.