[{"from": "human", "value": "Provide a description of this molecule. [C][C][=Branch1][C][=O][O-1].[C][C][=Branch1][C][=O][O-1].[C][C][=Branch1][C][=O][O-1].[Pr+3]"}, {"from": "gpt", "value": "The molecule is a praseodymium molecular entity in which a praseodymium(3+) cation is associated with three acetate anions. Used as a heavy atom in protein crystallography experiments (multiple-wavelength anomalous dispersion, multiple isomorphous replacement). It is a praseodymium molecular entity and an acetate salt."}]