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(a) Energy minimized molecular model of 6 (Gaussian, B3LYP/6–31+G(d), See Supporting Information). (b) Helicity of the N–(C=O)-Ar and C-3–O bond vectors subtends a negative angle (approximately θ = –66.5˚) in 6 corresponding to the 2R,3R,4aR,5S,8aS configuration of natural 1.
