Trimethoprim, English/Latin name: Trimethoprim, TMP for short. This product is white or almost white crystalline powder; it is odorless and has a bitter taste. This product is slightly soluble in chloroform, slightly soluble in ethanol or acetone, and almost insoluble in water; it is easily soluble in glacial acetic acid. The product has a melting point of 199~203ºC, molecular formula: C14H18N4O3, molecular weight: 290.31800, and absorption coefficient of 198~210. Trimethoprim is a synthetic broad-spectrum antibacterial agent, used alone for respiratory tract infections, urinary tract infections, intestinal infections and other diseases. It can be used to treat sepsis, meningitis, otitis media, typhoid fever, and Shigellosis caused by sensitive bacteria ( Bacillary dysentery), etc., the combination of trimethoprim and sulfa-2,6-dimethoxine can also be used to treat malaria resistant to chloroquine.