[{"from": "human", "value": "Could you provide a description of this molecule? [C][Branch2][Ring1][#Branch1][C][N][Branch1][#Branch2][C][P][=Branch1][C][=O][Branch1][C][O-1][O-1][C][P][=Branch1][C][=O][Branch1][C][O-1][O-1][N][Branch1][#Branch2][C][P][=Branch1][C][=O][Branch1][C][O-1][O-1][C][P][=Branch1][C][=O][Branch1][C][O-1][O-1].[Na+1].[Na+1].[Na+1].[Na+1].[Na+1].[153Sm+3]"}, {"from": "gpt", "value": "The molecule is the pentasodium salt of samarium Sm 153 lexidronam, a therapeutic agent consisting of a medium energy beta- and gamma-emitting radioisotope, samarium Sm 153, and a teraphosphonate chelator, ethylenediaminetetramethylene phosphonic acid (EDTMP). The chelator moiety of samarium Sm 153 lexidronam associates with hydroxyapatite crystals concentrated in areas of bone turnover, thereby selectively delivering samarium Sm 153-mediated cytotoxic radiation to osteoblastic bone metastases."}]