Imatinib Mesylate Alias: STI571 CAS NO.: 220127-57-1 M.F.: C29H31N7O.CH4O3S M.W.: 589.71 Assay: 99% Appearance: off-white or light yellow crystalline powder Package:25kg/fibre drum Specification: BP2007/USP31 Usage: Imatinib is a drug used to treat certain types of cancer. It is currently marketed as its mesylate salt, imatinib mesilate. It is used in treating chronic myelogenous leukemia (CML), gastrointestinal stromal tumors (GISTs) and some other diseases.