heteronuclear multiple-quantum correlation NMR 

Initialism: HMQC
https://doi.org/10.1351/goldbook.08354
Simplest implementation of an inverse detected A1A221H heteronuclear correlation nuclear magnetic resonance spectroscopy experiment.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 691 [Terms] [Paper]