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Applied Biological Chemistry
Fig. 3 | Applied Biological Chemistry

Fig. 3

From: 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 approach

Fig. 3

Two-dimensional 1H–13C HMBC correlation spectra of lup-20(29)-ene promoting; top: long range heteronuclear coupling contacts of around 2 Hz (d6 = 250 ms) and bottom: promotion of 3, 4, 5JH–X short-to long range heteronuclear contacts of around 7 Hz (d6 = 62.5 ms as the standard condition)

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