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Fig. 5. (A) Molecular structures of 1 and 2. (B) Gas-phase highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies of 1 and 2 (in hartree). (C) HOMOs (first four) and LUMOs (last three) of 1. (D) HOMOs (first four) and LUMOs (last three) of 2.