[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is an iminium ion that is a dark bluish synthetic dye used as a food colouring agent It has a role as a dye and an allergen."}, {"from": "gpt", "value": "[C][C][N][Branch1][Ring1][C][C][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][=Branch2][Ring1][C][=C][C][=C][C][=Branch1][Branch2][=N+1][Branch1][Ring1][C][C][C][C][C][=C][Ring1][O][C][=C][C][=Branch2][Ring1][Branch2][=C][Branch1][=N][C][=C][Ring1][=Branch1][S][=Branch1][C][=O][=Branch1][C][=O][O][S][=Branch1][C][=O][=Branch1][C][=O][O][O]"}]