Also available in 1 mL, 1 mg, 2 mg, 5 mg, 25 mg, 50 mg, 100 mg, 500 mg and bulk. Please contact Fisher for quotes. Dofequidar fumarate (MS-209)(MS-209 fumarate), a quinoline-based compound administered orally, is known for counteracting multidrug resistance (MDR) through the inhibition of ABCB1/P-glycoprotein (P-gp) and ABCC1/MDR-associated protein 1. Purity 99.43%