A water-soluble phosphate prodrug of N-acetylcolchinol with potential antiangiogenesis and antineoplastic activities. ZD6126 is converted in vivo into N-acetylcolchinol. N-acetylcolchinol binds to and destabilizes the tubulin cytoskeleton of endothelial cells in tumor blood vessels, which may result in tumor endothelial cel apoptosis, the selective occlusion of tumor blood vessels, cessation of tumor blood flow, and tumor necrosis. OR A substance that has been studied in the treatment of several types of cancer. ZD6126 destroys blood vessels in tumors and may prevent the growth of new blood vessels that tumors need to grow. It is a type of vascular targeting agent and a type of antiangiogenesis agent.