• Top library match: potassium sodium (2R,3R)-2,3-dihydroxybutanedioate tetrahydrate #112124

• The top library hit, potassium sodium (2R,3R)-2,3-dihydroxybutanedioate tetrahydrate, would not be expected to display the aromatic bands or the coumarin‑type combination pattern seen in the spectrum.
• The low library similarity (0.602) and the presence of divergent candidates in the top‑15 list indicate that the spectral match is weak and that the true material may be more complex.
• The exact chemical composition cannot be determined from the current data because the library search did not retrieve a high‑confidence, chemically coherent match.
• Aromatic, carbonyl, and polysaccharide‑like features are present, but they cannot be uniquely assigned to a single molecular structure without additional analytical information.

Recommended next steps: Obtain a high‑resolution mass spectrum and/or ¹H/¹³C NMR data to establish the molecular formula and core structure. Perform a solvent extraction or chromatography step to isolate the major component, followed by re‑analysis by FTIR and NMR for direct comparison with known standards. If the sample is suspected to contain a coumarin or flavonoid, use a reference library of natural products or synthesize a plausible candidate for comparison.