The NMR spectra were measured with Agilent 400 MR DDR2 (Agilent Technologies Inc., United States) using CDCl3 (Merck KGaA, Germany) as a solvent and referenced on residual CDCl3 signal (1H δ 7.26 ppm). The spectra of corresponding epimers were identical to NMR spectra published by Russo et al.11 (link).
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