Hz. As this is much larger than 4 JH3H5, the 13 C satellites display a first order multiplet (Figure ). Figures compares TSE-PSYCHEDELIC with the new SERFBIRD experiment, where in each case the chemically equivalent protons H2 and H6 are inverted by a WS-selective 180° pulse so that only couplings to these protons feature in F1. TSE-PSYCHEDELIC delivers a complicated 2DJ spectrum for the H3&H5[ 12 C] multiplet, with peak intensity distortions and intense strong coupling artifacts that also feature phase-twisted line shapes. The line splittings only very slightly deviate from the actual 3 JH2H3 and 5 JH3H6 couplings in this example due to the small value of 4 JH3H5. In contrast, SERFBIRD focuses on the H3[ 13 C a ] satellite signal, which delivers a 2DJ spectrum showing clean doublet of doublets, void from unwanted signals and with full absorption mode line shapes, from which the 3 JH2H3 and 5 JH3H6 couplings are straightforwardly read in F1. Pure shift versions of TSE-PSYCHEDELIC and SERFBIRD are shown in Figures and, which remove all remaining couplings from the chemical shift F2 dimension.