[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a white to pale yellow powdery solid. Sinks in water. (USCG, 1999)"}, {"from": "gpt", "value": "[O-1][W][=Branch1][C][=O][=Branch1][C][=O][O-1].[Pb+2]"}]