Fosbretabulin (Combretastatin A4 Phosphate (CA4P)) Disodium is the water-soluble prodrug of Combretastatin A4 (CA4), which is a microtubule-targeting agent that binds β-tubulin with Kd of 0.4 uM. Fosbretabulin Disodium inhibits the polymerization of tubuli Target:Microtubule Associat Pathway:Cytoskeletal Signaling MW:440.29