Eosin II is a chemical compound registered under CAS number 6441-80-1, with the molecular formula C22H8 Br4 Cl4 O5 . Na and a molecular weight of about 835.7 g/mol. It is also known as 2-(2,4,5,7-Tetrabromo-3-oxo-6-sodiooxy-3H-xanthen-9-yl)-3,4,5,6-tetrachlorobenzoic acid ethyl ester; C.I.45420; Cyanosine B. DeWeiChem supplies Eosin II for laboratory research and bulk production; product code 1160896. Send an inquiry for purity, packaging, price and lead time.