We can customize impurity reference materials for different API projects, such as: Rosuvastatin calcium project impurities (84 have been developed, 65 are in stock, the rest can be customized), Atorvastatin calcium impurities (50 have been developed, 43 are in stock, and the rest can be customized), Pitavastatin calcium impurities (46 have been developed, and the remaining can be customized) There are about 40 items in stock, the rest can be customized), Acetaminophen impurities in stock are more than 500mg in stock (large demand can be customized), Ornidazole impurities (24 developed, about 18 in stock, the rest can be customized), etc. we have developed 264 existing API projects, and nearly 10000 impurity reference materials can be evaluated and customized.