Fig. 1. (a) View of S···S and S···C contacts in the structure at 95 K with a parallel edge-to-edge conformation between the upper two molecules and a tilted face-to-edge conformation between the two bottom molecules. (b) Close contacts between an edge sulfur and the atoms of the thiophene ring of an adjacent tilted BTBT core. The shortest S1···Sⁱⁱⁱ contact (3.430 Å) is visible in part (a) of this figure as the dashed line between the two upper molecules. Symmetry codes: (i) 1/2 + x, 1 – y, z; (ii) 2 – x, 1/2 + y, 1.5 – z; and (iii) 1.5 – x, 1.5 – y, 1.5 – z.