[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is an aromatic hydrocarbon composed of a benzene ring linked to an ethyl group. Ethylbenzene is a constituent of petroleum and coal tar and is used as either a petroleum additive or a chemical intermediate in the production of polystyrene. High level exposure to airborne ethylbenzene is associated with eye and throat irritation."}, {"from": "gpt", "value": "[C][C][C][=C][C][=C][C][=C][Ring1][=Branch1]"}]