The FTIR spectrum is consistent with a material that combines aromatic, ester, amide, carbohydrate (pyranose-type) and aliphatic hydrocarbon functionalities. Although the library offered 4‑methylbenzenesulfonic acid hydrate as the nearest match, the observed bands are not dominated by sulfonate vibrations. Instead, the prominent features at 1732 cm⁻¹ (ester carbonyl), 1696 cm⁻¹ (amide I), 1067 cm⁻¹ (C–O stretching of pyranose units), and 1459 cm⁻¹ (CH₂ bending) point to a mixed ester/amide/carbohydrate conjugate bearing aliphatic chains and likely aromatic substitution FTIR In-Depth Interpretation was not selected for this task, so this section shows the library-search result only and no deep AI interpretation was run.