Direct Blue 74 is a chemical compound registered under CAS number 33540-94-2, with the molecular formula C36H25N7O13S4·4Na and a molecular weight of about 979.81 g/mol. Its EINECS (EC) number is 251-569-9. It is also known as C. I. Direct Blue 74; 2-Naphthalenesulfonic ac. KingChemi supplies Direct Blue 74 for laboratory research and bulk production; product code 1321922. Send an inquiry for purity, packaging, price and lead time.