tetrasodium 3-[[4-[[8-[[1-[(anilino)carbonyl]-2-oxopropyl]azo]-1-hydroxy-3,6-disulphonato-2-naphthyl]azo]naphthyl]azo]naphthalene-1,5-disulphonate

3-[[4-[[1-Hydroxy-8-[[2-oxo-1-[(phenylamino)carbonyl]propyl]azo]-3,6-bis[(sodiooxy)sulfonyl]naphthalen-2-yl]azo]naphthalen-1-yl]azo]-1,5-naphthalenedisulfonic acid disodium salt