[{"from": "human", "value": "Describe 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].[188Re]"}, {"from": "gpt", "value": "The molecule is a synthetic compound containing the bisphosphonate etidronate (hydroxyethylidene diphosphonate, HEDP) labeled with rhenium Re188, a beta-emitting radioisotope with potential antineoplastic activity. Upon administration, Re-188 etidronate binds to hydroxyapatite in bone, delivering a cytotoxic dose of beta radiation to primary and metastatic bone tumors. The beta-radiation may provide localized anti-tumor radiotoxicity while sparing extramedullary bone marrow tissues."}]