[{"from": "human", "value": "Could you give me a brief overview of this molecule? [131I][131I]"}, {"from": "gpt", "value": "The molecule is a radioactive isotope of iodine with an atomic mass of 131, a half life of eight days, and potential antineoplastic activity. Selectively accumulating in the thyroid gland, iodine I 131 emits beta and gamma particles, thereby killing thyroid cells and decreasing thyroid hormone production."}]