[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a yellow-orange crystalline solid. Denser than water and not soluble in water. Hence sinks in water. Melting point 48.5-49 \u00b0C. Used as a selective pre-emergence herbicide."}, {"from": "gpt", "value": "[C][C][C][N][Branch1][Ring2][C][C][C][C][=C][Branch2][Ring1][=Branch1][C][=C][Branch1][#Branch2][C][=C][Ring1][=Branch1][N+1][=Branch1][C][=O][O-1][C][Branch1][C][F][Branch1][C][F][F][N+1][=Branch1][C][=O][O-1]"}]