Ascomycin(Immunomycin, FR-900520, FK520)是tacrolimus (FK506)的类似物，具有很强的免疫抑制剂。 Ascomycin(Immunomycin, FR-900520, FK520) is an ethyl analog of tacrolimus (FK506) with strong immunosuppressant properties. A potent immunosuppressive agent application： Ascomycin is a potent immunosuppressive agent that could be used as a potential therapeutic agent for autoimmune diseases. Ascomycin is an inhibitor of PP2. It is an internal standard for LC-MS/MS testing of the immunosuppressants tacrolimus, sirolimus, and everolimus. This Certified Spiking Solution® is suitable for critical quantitative applications in clinical and diagnostic testing such as therapeutic drug monitoring assays to ensure patients remain within the narrow therapeutic range of these immunosuppressants.