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Chemical structures of the (a) 2,8-bis(thien-2-yl)-5-hexylthieno[3,4-c]pyrrole-4,6-dione (D-A-D) and (b) electroactive ligand 2-(5-mercaptothien-2-yl)-8-(thien-2-yl)-5-hexylthieno[3,4-c]pyrrole-4,6-dione (D-A-D-SH) and their synthetic pathways.
