Correlate protons with carbons two or three bonds away, one-bond peaks filtered out.
Checked against A. Bax, M. F. Summers, J. Am. Chem. Soc. 108, 2093–2094 (1986), doi:10.1021/ja00268a061; R. E. Hurd, B. K. John, J. Magn. Reson. 91, 648–653 (1991), doi:10.1016/0022-2364(91)90395-A; Bruker pulse program hmbcgplpndqf.
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