[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a chemical compound of antimony. Antimony is a metallic element with the chemical symbol Sb and atomic number 51. Small amounts of antimony are found in the earth's crust. (L741, L808)"}, {"from": "gpt", "value": "[C][=C][C][=Branch2][Ring1][#C][=C][C][=C][Ring1][=Branch1][N][Branch1][N][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][Br][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][Br][Br]"}]