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    6-methoxy-7-nitro-1-benzofuran-2-carbonitrile
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    6-methoxy-5-nitro-1-benzofuran-2-carbonitrile
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    6-hydroxy-5-nitro-1-benzofuran-2-carbonitrile
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    6-hydroxy-7-nitro-1-benzofuran-2-carbonitrile
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    6-methoxy-5-nitro-1-benzofuran-2-carboxylic acid
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