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(a) Structure of a unit cell of the quatertiophene diacetamide; DORI = 0.9 isosurfaces for (b) 1–9, (c) 6–9, α-quaterthiophene dimer, and (d) 1–9, e) 6–9, quaterthiophene diacetamide dimer. Isosurfaces are color-coded with sgn(λ2)ρ(r) in the range from −0.01 au (red) to 0.01 au (blue).
