[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a potassium salt that is the dipotassium salt of phosphoric acid. It has a role as a buffer. It is a potassium salt and an inorganic phosphate."}, {"from": "gpt", "value": "[O][P][=Branch1][C][=O][Branch1][C][O-1][O-1].[K+1].[K+1]"}]