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a) Key ROESY correlations indicated on the C-5/C-15 fragment of 1; b) Two possible rotamers around the C-9/C-10 bond; c) Most feasible rotamers around the C-10/C-11 bond of 1, with anticipated large/small heteronuclear coupling constant indicated on each. For b) and c) the JHH and JHC values (CDCl3) are listed below the Newman projections and the rotamer of best fit is indicated by a dashed outline.
