Ascomycin (Standard) is the analytical standard of Ascomycin. This product is intended for research and analytical applications. Ascomycin (Immunomycin, FR-900520, FK520) is an ethyl analog of Tacrolimus (FK506) with strong immunosuppressant properties. Ascomycin is also a macrocyclic polyketide antibiotic with multiple biological activities such as anti-malarial, anti-fungal and anti-spasmodic. Ascomycin prevents graft rejection and has potential for varying skin ailments research[1][2].