[{"from": "human", "value": "Describe this molecule. [O][P][=Branch1][C][=O][Branch1][C][O-1][O-1].[K+1].[K+1]"}, {"from": "gpt", "value": "The molecule is a highly water-soluble salt often used as a fertilizer and food additive as a source of phosphorus and potassium as well as a buffering agent."}]