Novel Guaianoids, Nardoguaianone E–I, from Nardostachys chinensis Roots

Five novel guaianoids, nardoguaianone E–I (1–5), were isolated from Nardostachys chinensis roots. They possessed a dienone moiety in their molecules. The relative structures were elucidated by spectral means and chemical transformation, and the absolute configurations were determined using the modified Mosherʹs method and by comparison of their CD spectra.