and the VXR -S 400 NMR spectrometers depends upon the nucleus, solvent, and the instrument (probe, etc.,). On the Unity+300, pw90 is 13.3 microseconds for proton and 9.7 microseconds for carbon . On the VXR-S 400, pw90 is 35.0 microseconds for proton and 13.0 microseconds for carbon. Routine experiments on these