1'-Hydroxy-4-[[4-[(1-hydroxy-4-sodiosulfo-2-naphthalenyl)azo]-7-sodiosulfo-1-naphthalenyl]azo]-6'-phenylamino[1,2'-azobisnaphthalene]-3',7-disulfonic acid disodium salt
2-[[4-[[4-[(6-Amino-1-hydroxy-3-sodiosulfo-2-naphthalenyl)azo]-1-naphthalenyl]azo]-6-sodiosulfo-1-naphthalenyl]azo]benzene-1,4-disulfonic acid disodium salt