This standard is applicable to food additive 3-[(4-amino-2, 2-dioxido-1H-2, 1, 3-benzothiadiazin-5-yl)oxy]-2, 2-dimethyl-N-propylpropanamide prepared by chemical reaction with 3-hydroxy-2,2-dimethylpropionic acid, propylamine, 2-amino-6-fluorobenzonitrile and aminosulfonyl chloride as raw materials.