Glycine, N-[3-amino-4-[[7-[[4-[[4-[[7-[[2-amino-4-[(carboxymethyl)amino]phenyl]azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]phenyl]amino]-2-sulfophenyl]azo]-8-hydroxy-6-sulfo-2-naphthalenyl]azo]phenyl]-, trisodium salt