4-メチル-5-(磺メチルアミノ)-2-(2-チアゾール偶窒素)ベンゼンギ酸

4-Methyl-5-(sulfomethylamino)-2-(2-thiazolylazo)benzoic acid 97%，for spectrophotometric det. of Co(II), Cu(II), ≥90%