Profile: Sichuan Xieli Pharmaceutical Co., Ltd. specializes in offering intermediates and APIs. Our products are hesperidin, daidzein, genistein, rutin, troxerutin, topotecan hydrochloride and camptothecin. Camptothecin and its derivatives are unique in their ability to inhibit DNA topoisomerase, by stabilizing a covalent reaction intermediate termed the cleavable complex, which ultimately causes tumor cell death. In the clinical field , it is widely believed that camptothecin analogs exhibited remarkable anti-tumour and anti-leukemic activity. Hesperidine is extracted from citrus aurantium L. It has a vitamin P efficacy, keeping haemal filter press, lowering haemal brittleness and shortening the time of shed blood. It is a kind of assistant and stanch medicine to cure high blood pressure and capillary vessel hemorrhage naturally in clinic.