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    (5-hydroxy-8-methoxy-2-methyl-4-oxo-4H-chromen-7-yloxy)-acetic acid methyl ester
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    (6-formyl-5,8-dimethoxy-2-methyl-4-oxo-4H-chromen-7-yloxy)-acetic acid
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    (6-formyl-5-hydroxy-8-methoxy-2-methyl-4-oxo-4H-chromen-7-yloxy)-acetic acid methyl ester
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    (6-formyl-5,8-dimethoxy-2-methyl-4-oxo-4H-chromen-7-yloxy)-acetic acid methyl ester
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