[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is an organotin compound. It is used in organic synthesis for transition-metal mediated conversion of acid chlorides to methyl ketones and aryl halides to aryl methyl ketones. Tin is a chemical element with the symbol Sn and atomic number 50. It is a natural component of the earth's crust and is obtained chiefly from the mineral cassiterite, where it occurs as tin dioxide. (L307, L309, L315)"}, {"from": "gpt", "value": "[C][Sn][Branch1][C][C][Branch1][C][C][C]"}]