Fig. 5From: Nuclear magnetic resonance assignment strategy for pentacyclic triterpenes, using lup-20(29)-ene from Pilotrichella flexilis as model system, combining spectrally filtered proton-to-carbon schemes and DFT–GIAO approachTwo-dimensional TOCSY proton–proton homonuclear correlation spectra, using a Hartman–Hahn transfer with a DIPSI element, promoting 1H–1H long range through bound contacts with 500 ms of mixing time. Top: Broadband proton homodecoupling using Psyche element in F1 and further spectral symmetrization. Bottom: Standard scheme with no pure shift Proton homodecouplingBack to article page