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a) Newman projections along the C-16/C-17 and C-20/C-21 bonds in 1; b) The most feasible cis orientation of the THF ring with double-headed arrows indicating ROESY correlations; c) Newman projection along the C-21/C-22 bond with applicable JHH and JHC values (CDCl3) indicated on the right. d) Newman projection along the C-22/C-23 bond and relevant coupling constants.
