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The experimental (solid line, left axes) and simulated (dotted line, right axes) ECD spectra of four diastereoisomers of 6. The best experimental-simulated fit belongs to the diastereoisomer with the absolute configuration 10S, 12S, 3′S, 15S. The theoretical ECD spectra of the enantiomers of the presented diastereoisomers are the exact inversions of the ones depicted here and do not fit the experimental data.
