Chemistry Heterocyclic Building Blocks Pyrans chromene-carboxylic acid
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6-Fluoro-4-oxo-4H-chromene-2-carboxylic acid
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7-Fluoro-4-oxo-4H-chromene-2-carboxylic acid
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2-Oxo-7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2H-chromene-3-carboxylic acid
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2-Amino-7-ethyl-5-oxo-5H-chromeno[2,3-b]pyridine-3-carboxylic acid