(2E)-Δ2,2'(3H,3'H)-Bi[1-benzothiophene]-3,3'-dione;(2E)-Δ2,2'(3H,3'H)-Bi[benzo[b]thiophene]-3,3'-dione;(2E)-Δ2,2'-Bi[benzo[b]thiophene-3(2H)-one];trans-Thioindigo
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