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PES obtained at the PBE/6-31G* level of theory showing potential energy as a function of rotations of two substituents (R3, R4) around the bonds C3-C1-Sub and C5-C1-Sub: (a) 2-thiophenyl groups in molecule A7, (b) ethyl groups in molecule B7, and (c) phenyl groups in molecule C7. Black circles indicate the calculations performed for the corresponding values of the angles. White letters indicate conformations which are described in the Figure 2.
