3,5-Dinitrosalicylic acid is a dinitrated derivative of salicylic acid. 3,5-Dinitrosalicylic acid is used in preparing DISAL glycosyl donors, as well as colorimeteric determination of reducing sμgars and glycosidase activity. Proton-transfer compounds composed of 3,5-Dinitrosalicylic acid/Strychnine and 3,5-Dinitrosalicylic acid/benzidine have also been described. A salicylic acid derivative used in colorimeteric determination of reducing sμgars.