Product description: 1.Chemical name: bis [4 - (n-ethyl-n-3-sulfophenylmethyl) aminophenyl] - 2-sulfonic acid toluene disodium salt 2.Chemical structure: 3.Molecular formula: c37h34n2na2o9s3 Relative molecular weight: 792.85 (according to 2001 international relative atomic mass) Product standard: gb7655.1-2005 Appearance requirement: purplish red powder