see Protein NMR Spectroscopy – Principles and Practice by J. Cavanagh, W. Fairbrother, A.G. Palmer III and N.J. Skleton (Academic Press). (Link to Publisher)
Minimum labelling: 13C
The magnetisation is transferred from 1H to 13C and then back again for detection and all 1H-13C moieties, regardless of chemical type, are observed.
This is the carbon equivalent of the 1H-15N-HSQC. All H-C correlations are shown. It can be useful as a basis for picking a 3D 13C NOESY spectrum. It can also be a useful reference for the aromatic peaks.