| Sample “in natura” | Sample after sun exposure | Organic group | Vibration mode | ||
| Wave number cm−1 | Band area cm2 | Wave number cm−1 | Band area cm2 | - | - |
| 3005 | 3.71 | 3111 a 3005 | 58.67 | =C-H (cis) | Axial deformation |
| 2953, 2922, 2852 | 2232.25 | 2953, 2922, 2852 | 2081 | -C-H (CH3), -C-H (CH2) | Asymmetric and symmetrical axial deformation |
| 1747 | 118.47 | 1739 | 1788.65 | -C=O | Axial deformation |
| 1670 | 2.65 | Absent | - | C=C (trans) | Axial deformation |
| 1652 | 9.42 | Absent | - | C=C (cis) | Axial deformation |
| 1462 | 306.87 | 1462 | 500.87 | -C-H (CH2) | Symmetrical angular deformation |
| 1417 | 2.39 | Absent | - | =C-H (cis) | Angular deformation |
| 1396 | 2.44 | Absent | - | =C-H (cis) | Angular deformation |
| 1377 | 101.15 | 1375 | 817.33 | -C-H (CH3) | Symmetrical angular deformation |
| 1215 | 4.63 | 1228, 1217, 1205 | 777.03 | C-O | Axial deformation |
| 1161 | 99.86 | 1161 | 36.43 | C-O | Axial deformation |
| 721 | 123.21 | 721 | 90.22 | -(CH2)n- | Asymmetric angular deformation |