[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][N][Branch2][#Branch1][=C][C][C][N][Branch2][#Branch1][C][C][C][N][Branch2][=Branch1][=Branch1][C][C][N][Ring1][N][C][C][=Branch1][C][=O][N][C][C][C][C][C][C][=Branch1][C][=O][N][Branch2][Ring2][C][C][C][C][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][C][=Branch1][C][=O][N][C@@H1][Branch1][Branch2][C][C][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O][C][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][Br][C][C][=Branch1][C][=O][O-1][C][C][=Branch1][C][=O][O-1][C][C][=Branch1][C][=O][O-1].[68Ga+3]"}, {"from": "gpt", "value": "The molecule is a radioconjugate composed of PSMA-R2, a human prostate-specific membrane antigen (PSMA)-targeting ligand, conjugated to the beta-emitting radioisotope gallium Ga 68, with potential imaging activity during positron emission topography/computed tomography (PET/CT). Upon administration of gallium Ga 68 PSMA-R2, the PSMA-R2 moiety targets and binds to PSMA-expressing tumor cells. This allows for visualization of PSMA-expressing cells upon imaging. PSMA, a tumor-associated antigen (TAA) and type II transmembrane protein, is expressed on the membrane of prostatic epithelial cells and overexpressed on the majority of prostate tumor cells."}]