T 7723 (OTTO) Trolox, 97% CAS 53188-07-1 - used as an antioxidant standard. T 7723 (OTTO) Trolox, 97% CAS 53188-07-1 - used in 6-hydroxy-2,5,7,8-tetramethyl chromane-2-carboxylic acid equivalent antioxidant assay (TEAC) to determine the total antioxidant capacity of different fruit species.