[{"from": "human", "value": "Provide a description of this molecule. [C][C][=C][Branch2][Ring2][S][C][=C][Branch2][Ring2][C][C][C][C@@][Branch1][Ring2][O][Ring1][=Branch1][Branch1][C][C][C][C][C][C@H1][Branch1][C][C][C][C][C][C@H1][Branch1][C][C][C][C][C][C][Branch1][C][C][C][C][=Branch1][=Branch1][=C][Ring2][Ring1][O][O][C][C]"}, {"from": "gpt", "value": "The molecule is a naturally-occurring form of vitamin E, a fat-soluble vitamin with potent antioxidant properties.  Considered essential for the stabilization of biological membranes (especially those with high amounts of polyunsaturated fatty acids), d-alpha-Tocopherol is a potent peroxyl radical scavenger and inhibits noncompetitively cyclooxygenase activity in many tissues, resulting in a decrease in prostaglandin production.  Vitamin E also inhibits angiogenesis and tumor dormancy through suppressing vascular endothelial growth factor (VEGF) gene transcription. (NCI04)"}]