643015-84-3

2,7-Naphthalenedisulfonic acid,4,5-dihydroxy-3-[[4-[[5-hydroxy-3-methyl-1-(4-sulfophenyl)-1H-pyrazol-4-yl]azo]-2-sulfophenyl]azo]-6-[(4-nitro-2-sulfophenyl)azo]-