1,It come from Streptomyces olivoreticuli 2,This drug is a competitive, reversible protease inhibitors. 3,It has an inhibitory effect on arginylaminopeptidase, leukotriene A4 hydrolase, alanyl aminopeptidase, and leucyl/cyanoamido peptidase. 4,This product can enhance immune function, used for anti-cancer chemotherapy, adjuvant treatment of radiotherapy, senile immune function defects. It can be combined with chemotherapy, radiotherapy and combined application in leukemia, multiple myeloma, myelodysplastic syndrome and hematopoietic stem cell transplantation, as well as other solid tumor patients.