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5-Chlorothiophene-2-carboxylic acid 5-Methylthiophene-2-carboxaldehyde 5-Bromo-2-thiophenecarboxylic acid 5-CHLOROTHIOPHENE-2-CARBONYL CHLORIDE 5-Bromothiophene-2-carbaldehyde 2-Chloro-5-thiophenecarboxaldehyde 5-FLUORO-2-THIOPHENECARBOXYLIC ACID 4-Bromothiophene-2-carbonitrile 3-BROMOTHIOPHENE-2-CARBONITRILE 2-Bromothiophene-3-carbonitrile