400 MHz Proton Nuclear Magnetic Resonance Study of Magydardienediol, a Diterpene from Magydaris panacifolia

A detailed analysis of the 400 MHz 1H-NMR spectrum of magydardienediol (1), a diterpene isolated from Magydaris panacifolia (Vahl) Lange, has been performed by use of a combination of proton homonuclear spin decoupling, COSY, NOE difference, and NOESY techniques. This 1H-NMR spectral analysis, in conjunction with the mass spectral analysis of some derivatives of 1, revealed that the structure of 1 should be revised to t-6-hydroxymethyl-1,t-3-dimethyl-t-2-(3-methyl-2-butenyl)-3-(4-methyl-3-pentenyl)-γ-1-cyclohexanol.