 They showed that the 1H- and 13C-NMR spectra matched that of the compound isolated by Gräfe, confirming Rychnovsky's structure.La Clair claimed that since the two structures were isomers, it is possible that they would have similar 1H-NMR spectra.However, a later paper by Saielli and Bagno claims that there would be significant differences in the 1H- and 13C-NMR spectra of compounds (1) and (2).