In one form of this technique, distortionless enhancement by polarization transfer is an alternative to the APT. The Karplus equation relates dihedral angles to the coupling constant (10[1])measured in this technique. (10[1])Most forms of this technique use a Fourier transform (-5[1])to analyze the free induction decay that occurs as a result of relaxation. TMS is used as a standard in several forms of this technique, which normalizes frequencies (-5[1])of peaks to chemical (-5[1])shift. This technique’s most common forms use hydrogen-1 (10[2])and carbon-13 since they have a non-zero (10[1])spin. For 10 points, name this technique where chemical structures are determined by a strong magnetic field applied to nuclei. ■END■ (10[3]0[2])