Full assignments of proton and carbon signals of picrasidine‐G by 1D and 2D NMR methods

Abstract The alkaloid picrasidine‐G was isolated from Picrasma quassioides. This alkaloid has previously been reported as a new natural product, but its 13C NMR signals still remain unassigned and some ambiguities remains in the proton assignments. Analysis of the 1H and 13C NMR spectra and 1 D NOE and 2D NMR spectra led to the unambiguous assignment of the 1H and 13C signals of picrasidine‐G.