Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy or magnetic resonance spectroscopy (MRS), is a research technique that exploits the magnetic properties of certain atomic nuclei. This type of spectroscopy determines the physical and chemical properties of atoms or the molecules in which they are contained.

 NMR SOLVENT

Ref :  https://en.wikipedia.org/wiki/Nuclear_magnetic_resonance_spectroscopy