The FTIR evidence does not support a firm assignment to 2-cyclopentylacetic acid as a specific compound. The spectrum is better described more broadly as a carbonyl-containing organic material with oxygenated aliphatic character. The strongest spectral features are the paired carbonyl-region bands at 1774 and 1715 cm-1 together with C-O region bands at 1236, 1120, and 1024 cm-1, which are more consistent with an oxygen-rich carbonyl system such as an ester-, anhydride-, lactone-, or related oxidized organic material than with a simple hydrocarbon. The weak library result and absence of direct or related literature support prevent a narrower conclusion