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Conformers of the BHAP E-enol-imine form. The B3LYP/6-311++G(d,p) calculated optimized Cartesian coordinates of each conformer are provided in the Supporting Information Table S1. The conformationally relevant dihedral angles α, β, ϒ, δ are indicated over the structure of conformer I. Note that all conformers have a symmetry related structure.
