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5-Chlorothiophene-2-carboxylic acid 5-BROMOTHIOPHENE-2-CARBONITRILE 5-Methylthiophene-2-carboxaldehyde 5-Bromo-2-thiophenecarboxylic acid 5-CHLOROTHIOPHENE-2-CARBONYL CHLORIDE 5-Bromothiophene-2-carbaldehyde 2-Chloro-5-thiophenecarboxaldehyde 2-Thiophenecarboxylic acid, 4-bromo-3-fluoro-, methyl ester 2-Thiophenecarboxylic acid, 5-bromo-4-fluoro-, methyl ester