[{"from": "human", "value": "Please give me some details about this molecule. [C][Si][Branch1][C][C][Branch1][C][C][C][C][C][=Branch1][C][=O][O-1].[Na+1]"}, {"from": "gpt", "value": "The molecule is an organic sodium salt composed of sodium and 3-(trimethylsilyl)propionate ions in a 1:1 ratio. It is used as internal reference in the NMR spectrum nuclear magnetic resonance for aqueous solvents (e.g. D2O). It contains a 3-(trimethylsilyl)propionate."}]