[{"from": "human", "value": "Could you provide a description of this molecule? [H+1].[H+1].[H+1].[H+1].[C][C][Branch2][N][C][C@H1][C][=Branch1][C][=O][N][C@@H1][Branch2][#Branch2][=Branch1][C][S][S][C][C@@H1][Branch2][=Branch1][C][C][=Branch1][C][=O][N][C@H1][Branch2][Ring2][=N][C][=Branch1][C][=O][N][C@@H1][Branch2][Ring1][=Branch1][C][=Branch1][C][=O][N][C@H1][Branch1][=Branch2][C][=Branch1][C][=O][N][Ring2][Ring1][=Branch2][C][C][C][C][N][C][C][=C][N][C][=C][C][=C][C][=C][Ring1][=Branch1][Ring1][=Branch2][C][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][O][N][C][=Branch1][C][=O][C@@H1][Branch1][#Branch2][C][C][=C][C][=C][C][=C][Ring1][=Branch1][N][C][=Branch1][C][=O][C][C][C][C][=Branch1][C][=O][N][C][C][N-1][C][C][N-1][C][C][Branch1][=Branch2][C][N-1][C][C][N-1][C][Ring1][=C][Branch1][#Branch2][C][N-1][C][C][N-1][C][Ring2][Ring1][Ring2][C][C][=Branch1][C][=O][N][C@@H1][Branch1][=Branch1][C][Branch1][C][C][O][C][=Branch1][C][=O][O][O].[64Cu+2]"}, {"from": "gpt", "value": "The molecule is a radioconjugate consisting of the tyrosine-containing somatostatin analog Tyr3-octreotate (TATE) conjugated with the bifunctional chelator 5-(8-methyl-3,6,10,13,16,19-hexaaza-bicyclo[6.6.6]icosan-1-ylamino)-5-oxopentanoic acid (MeCOSar) and labeled with the positron emission tomography (PET) tracer copper Cu 64, which may be used to image somatostatin receptor (SSTR)-expressing neuroendocrine tumors (NETs) upon PET. Upon administration of copper Cu 64-MeCOSar-Tyr3-octreotate, the TATE moiety targets and binds to SSTRs, with high affinity for type 2 SSTR, present on the cell membranes of many types of NETs. This allows for visualization of SSTR-positive tumor cells upon PET. TATE is an octreotide derivative in which phenylalanine at position 3 is substituted by tyrosine and position 8 threoninol is replaced with threonine. SSTRs have been shown to be present in large numbers on NETs and their metastases, while most other normal tissues express low levels of SSTRs."}]