The FTIR spectrum is most consistent with an aromatic phosphate/ester material, likely a poly(diphenoxyphosphazene) polymer or a closely related phosphazene derivative. The spectrum displays bands characteristic of aromatic rings (1603, 1507 cm⁻¹), phenoxy C–O stretching (1238, 1160 cm⁻¹), and phosphate P–O–C vibration (914 cm⁻¹) [4]. Aliphatic C–H stretching and bending modes (714, 1429, 1475 cm⁻¹) are also present, together with C–O single bond absorptions that resemble those of polysaccharides, indicating significant oxygen content and raising the possibility of co‑formulated components or a mixed composition 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.