Chemical name: 【(2Z)-4-oxo-4-(1H-pyrrol-2-yl)but-2-enoato-kO】sodium; 
Molecular formula: C8H6NNaO3, 
molecular weight: 187.13; 
Property: white or off-white crystalline powder, odorless, bitter, slightly irritating, soluble in water; 
Content: calculated according to the anhydrate, containing sodium Nuo Kasu (C8H6NNaO3) not less than 97%, water ≤ 3.0%, heavy metal ≤ 0.001%. 
【Pharmacological action】 This product mainly prevents the virus from penetrating into the host cell and affects the shelling of the virus, effectively inhibiting the replication of the virus in the body, and significantly inhibiting the DNA virus and the RNA virus. In addition to its antiviral effect, this product also has a strong ability to scavenge free radicals, protect cells, enhance cellular immunity, humoral immunity, and enhance the phagocytic activity of phagocytic cells on pathogenic microorganisms such as viruses and bacteria. After oral administration, it is easily absorbed by the gastrointestinal tract. At the peak concentration in the blood 30 minutes after administration, most of the liver and intestinal esterase are converted into active metabolites, and most of them are excreted by the kidney within 36 hours.