The assignment of 13C signals of synthetic (25R)-5α -furostanes together with the main 1H characteristics of the furostane side chain are presented. The main effects on chemical shifts due to conversion of ring F into an open chain are briefly discussed.
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NMR spectra were recorded on a Bruker 250 ACF spectrometer using CDCl3 as solvent with TMS (1H) or the solvent signal at 77.0 ppm (13C) as references. The probe temperature was 300 K and concentrations were 30 mg/ml for 13C spectra and 10 mg/ml for 1H spectra.
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