... 1H NMR spectra were obtained at 300 MHz in CDCl3 with chemical shift values (d) in ppm downfield from tetramethylsilane, and 13C NMR spectra were obtained at 100.61 MHz in CDCl3 . ... Polyoxygenated Cyclohexane Natural Products 3991±3996 Chem. Eur. J. 2000, 6, No. ...