[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an isocyanate that is the 4-isocyanato derivative of diphenylmethane. It has a role as an allergen."}, {"from": "gpt", "value": "[C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][N][=C][=O]"}]