Thieno[2',3':4,5]thieno[3,2-b]thieno[2,3-d]thiophene;Thieno[3,2-b]thieno[2',3':4,5]thieno[2,3-d]thiophene;Thieno[2',3';4,5]thieno[3,2-b]thieno[2,3-d]thiophene
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