4-[(1-Hydroxy-5-sodiosulfo-2-naphthalenyl)azo]-4'-[(1-hydroxy-6-phenylamino-3-sodiosulfo-2-naphthalenyl)azo]-1,1'-biphenyl-3,3'-dicarboxylic acid disodium salt | 4-[(1-Hydroxy-5-sodiosulfo-2-naphthalenyl)azo]-4'-[(1-hydroxy-6-phenylamino-3-sodiosulfo-2-naphthalenyl)azo]-1,1'-biphenyl-3,3'-dicarboxylic acid disodium salt | |