MF: C20H19N3OCH4O3S, MW: 413.5, Solubility: 20.7 mg/mL in DMSO, 3.15 mg/mL in EtOH with ultrasonic and warming,insoluble in H2O. Obatoclax mesylate, also known as GX15-070, is a hydrophobic small molecule that potently inhibits BCL-2 family by binding to the BH3-binding site of BCL-2 and other related BCL-2 family members (including BCL-XL, MCL-1, A1, and BCL-B).