CAS 6428-17-7 7-[[4-[(6-Ureido-1-hydroxy-3-sodiosulfo-2-naphthalenyl)azo]benzoyl]amino]-4-hydroxy-3-[[2-methyl-4-[(2-methyl-4-sodiosulfophenyl)azo]phenyl]azo]naphthalene-2-sulfonic acid sodium salt (HCID 178860307)|Huagongshe