3,5-Dinitrosalicylic acid - is an aromatic compound that reacts with reducing sugars and other reducing molecules to form 3-amino-5-nitrosalicylic acid, which strongly absorbs light at 540 nm.
D 2217 (OTTO) 3,5-Dinitrosalicylic acid, GR 99%+ Cas 609-99-4 - used in assay of alpha-amylase. However, enzymatic methods are usually preferred due to DNS lack of specificity.