The overlap of two HSQC spectra recorded with 10 and 9.9 ppm carbon spectral windows gives rise to highly resolved signals with a pattern providing unambiguous precise and accurate chemical shifts (see picture). Alternatively, the new DENA-HSQC pulse sequence takes advantage of a differential evolution of carbon chemical shift to do the same in a single experiment. Combined with multiplicity edition, DENA-HSQC advantageously replaces commonly used 1D DEPT-135 experiments.