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2-Thiophenecarboxaldehyde Dibenzothiophene Thianaphthene 3-Thiophenecarboxaldehyde 5-FORMYL-2-THIOPHENECARBOXYLIC ACID 5-Acetylthiophene-2-carboxylic acid 5-ACETYL-2-THIOPHENECARBALDEHYDE 2,5-Thiophenedicarboxylic acid 2,3-THIOPHENEDICARBOXALDEHYDE 2,3-DIHYDROTHIENO[3,4-B][1,4]DIOXINE-5,7-DICARBALDEHYDE