1,7-Dihydroxy-8-[[4'-[[2-hydroxy-3,6-bis(sodiosulfo)-1-naphthalenyl]azo]-3,3'-dimethoxy-1,1'-biphenyl-4-yl]azo]-4-(sodiosulfo)naphthalene-2-carboxylic acid sodium salt
1,7-Dihydroxy-8-[[4'-[[2-hydroxy-3,6-bis(sodiosulfo)-1-naphthalenyl]azo]-3,3'-dimethoxy-1,1'-biphenyl-4-yl]azo]-4-(sodiosulfo)naphthalene-2-carboxylic acid sodium salt