Long-range proton-carbon coupling constants can be extracted from 2D 13C-detected experiments From 2D F1-1H-coupled 13C-detected long-range optimized experiments ( 84JMR526-58 , 89JMR69-85 ). Rough estimation from cross-peak intensity analysis in COLOC and long-range optimized HETCOR experiments. 2D J-resolved 13C-detected experiments utilizing selective proton pulses. Selective 2D Spin-Flip Selective 2D J-INEPT Selective 2D J-DEPT 13C-edited J-resolved experiments ( 88JMR376-78 and 89JMR642-93 ). SELRESOLV experiment ( 90MRC994 ).