4-((4'-((8-Amino-1-hydroxy-5,7-disulfonaphthalen-2-yl)diazenyl)-3,3'-dimethyl-[1,1'-biphenyl]-4-yl)amino)-4-oxobutanoic acid 1g

4-((4'-((8-Amino-1-hydroxy-5,7-disulfonaphthalen-2-yl)diazenyl)-3,3'-dimethyl-[1,1'-biphenyl]-4-yl)amino)-4-oxobutanoic acid 1g