In one form of this technique, distortionless enhancement by polarization transfer is an alternative to the APT. (10[1])The Karplus equation relates dihedral angles to the coupling constant measured in this technique. Most forms (10[1])of this technique use a Fourier (10[1])transform to analyze the free induction decay that occurs as a result of relaxation. TMS is used as a standard (10[1])in several forms of this technique, which normalizes frequencies of peaks to chemical shift. (-5[1])This technique’s most common forms use hydrogen-1 and carbon-13 since they have a non-zero spin. For 10 points, name this technique where chemical structures are determined by a strong magnetic field applied to nuclei. ■END■ (10[1])