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            Thiophenes
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            > 3-Thiophenecarboxaldehyde
            > 3-Thiophenecarboxylic acid
            > 5-Methyl-2-thiophenecarboxaldehyde
            > 2-Thiophenecarboxylic acid
            > 2-Thiophenecarbonyl chloride
            > 2-Thiophenemethanol
            > 2-Acetylthiophene
            > 2-Chloro-5-nitropyridine
            > 2-Chloro-3-Methylthiophene
            > 3-Bromothiophene
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