[{"from": "human", "value": "Could you provide a description of this molecule? [C][C][Branch1][C][O][Branch1][#Branch2][O][P][=Branch1][C][=O][Branch1][C][O][O][O][P][=Branch1][C][=O][Branch1][C][O][O].[186Re]"}, {"from": "gpt", "value": "The molecule is an synthetic compound containing the organic phosphonate hydroxyethylidene diphosphonate (HEDP) labeled with the radioisotope rhenium Re 186. Re-186 etidronate binds to hydroxyapatite in bone, delivering a cytotoxic dose of beta radiation to primary and metastatic bone tumors. Re-186 is a beta emitter with a short half-life, a radioisotope profile that provides localized antitumor radiocytotoxicity while sparing extramedullary bone marrow tissues."}]