Fig. 1From: 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 1H NMR resonances depicted within the standard proton direct excitation spectrum (black, bottom) and the real-time 1H broadband instant-homodecoupling Zangger–Sterk pure shift experiment (blue, top)Back to article page