[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C@@H1][C@H1][Branch2][Ring2][C][C@H1][Branch2][Ring1][=N][C@@H1][Branch1][Ring2][O][Ring1][Branch1][N][C][=C][Branch1][=N][C][=Branch1][C][=O][N][C][=Branch1][Ring2][=N][Ring1][#Branch1][N][N][=C][Ring1][O][Br][O][O][P][=Branch1][C][=O][Branch1][Branch1][O][Ring2][Ring1][#Branch1][O]"}, {"from": "gpt", "value": "The molecule is a 3',5'-cyclic purine nucleotide that is 3',5'-cyclic GMP bearing an additional bromo substituent at position 8 on the guanine ring. A membrane permeable cGMP analogue that activates protein kinase G (PKG). It is 4.3-fold more potent than cGMP in activating PKG1alpha and promotes relaxation of tracheal and vascular smooth muscle tissue in vitro. It has a role as a muscle relaxant and a protein kinase G agonist. It is a 3',5'-cyclic purine nucleotide and an organobromine compound. It is functionally related to a 3',5'-cyclic GMP."}]