p-((4-((2-Hydroxy-1-naphthyl)azo)phenyl)azo)benzenesulphonic acid,compound with 2,2',2''-nitrilotriethanol (1:1);4-[(E)-{4-[(2Z)-2-(2-oxonaphthalen-1(2H)-ylidene)hydrazinyl]phenyl}diazenyl]benzenesulfonic acid - 2,2',2''-nitrilotriethanol (1:1)
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