[{"from": "human", "value": "Please give me some details about this molecule. [C][C][C@@H1][Branch1][S][C@@H1][Branch1][Branch1][N][C][Ring1][=Branch1][C][=C][C][=C][C][=C][Ring1][=Branch1][N][C][C][=C][Branch2][Ring1][#Branch2][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][N][C][=Branch1][=Branch1][=N][N][=N][Ring1][Branch1][C][Branch1][C][F][Branch1][C][F][F][O][C][18F]"}, {"from": "gpt", "value": "The molecule is a radioconjugate consisting of the positron emitting radioisotope fluorine F 18 conjugated to the substance P antagonist receptor quantifier (SPA-RQ) used in radioimaging. [18F]-labeled substance P antagonist receptor quantifier is an antagonist of the neurokinin 1 (substance P) receptor (NK1R) and can function as a positron emission tomography (PET) imaging agent for detecting NK1R-expressing cells and tissues. NK1Rs are frequently expressed on the plasma membranes of tumor cells from glioblastoma and breast and pancreatic carcinomas."}]