2-[[6-[[4-[[6-(benzoylamino)-1-hydroxy-3-sulpho-2-naphthyl]azo]-3-methylbenzoyl]amino]-1-hydroxy-3-sulpho-2-naphthyl]azo]benzoic acid, sodium salt

Benzoic acid, 2-[[6-[[4-[[6-(benzoylamino) -1-hydroxy-3-sulfo-2-naphthalenyl]azo]-3-methylbenzoyl ]amino]-1-hydroxy-3-sulfo-2-naphthalenyl]az o]-, sodium salt