[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is an organic sodium salt resulting from the replacement of the proton from one of the carboxy groups of fumaric acid by a sodium ion. It has a role as a food acidity regulator. It contains a fumarate(1-)."}, {"from": "gpt", "value": "[C][=Branch1][#Branch1][=C][/C][=Branch1][C][=O][O-1][\\C][=Branch1][C][=O][O].[Na+1]"}]