EZSolution Rapamycin. An immunosuppressant, Synonyms: 23,27-Epoxy-3H-pyrido[2,1-c][1,4]oxaazacyclohentriacontine, AY 22989, Sirolimus, Purity: G98% by High-performance liquid chromatography, CAS Number: 53123-88-9, Molecular Formula: CG1HG9NO1G, 5mg.