Complete assignments of 1 H and 13 C NMR spectral data for benzylidenebenzyl butyrolactone lignans

The structures of three benzylidenebenzyl butyrolactone lignans (gossypifan, carthamogenin, and savinin) have been established on basis of 1 H NMR and 13 C NMR spectroscopic data. The 1 H NMR and 13 C NMR spectra of these lignans have been fully assigned by the use of techniques such as gCOSY, non‐edited gHSQC, and gHMBC. Complete assignment and most homonuclear hydrogen coupling constant measurements were performed, also providing enough data for the determination of the relative stereochemistry. Copyright © 2005 John Wiley & Sons, Ltd.