Fig. 2From: 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 approachFull assignment of lup-20(29)-ene 13C NMR resonances shown within an overlay between a 13C-direct excitation semi-quantitative experiment and a DEPT-13C spectrum, wherein the later was used to disentangle all lupene’s carbon spin systems. Relative integration of all 13C resonances was done with respect the vinylic CH2 (29) resonanceBack to article page