72379-56-7

5-[[4-[[8-[[(3-Carboxy-4-hydroxyphenyl)sulfonyl]amino]-1-hydroxy-3,6-disulfo-2-naphthalenyl]azo]-3-ethoxy-7-sulfo-1-naphthalenyl]azo]-2-hydroxy-3-sulfobenzoic acid hexasodium salt