| 500 | C–CH3 out-of-plane bending mode |
679 | | S–O stretching |
721 | | C–C aromatic ring |
| 775 | C–S strong band |
1040, 1176 | | C–S asymmetric stretching |
| 1049 | S=O weak band |
1164 | | SO3 symmetric stretching |
| 1180 | CH3 out-of-plane bending |
| 1210 | C–N stretching vibration |
| 1320 | C–CH3 stretching vibration |
| 1345, 1373 | CH3 weak band (symmetric stretching vibration) |
| 1400, 1650 | C–C stretching modes |
| 1427, 1440 | CH3 weak band (asymmetric in plane) |
1360, 2850 | | C–H stretching and bending vibration of methyl group |
1508 | | C–N stretching |
| 1544 | Aromatic / hetero-strong |
| 1576 | C–C aromatic ring chain vibration |
1579 | | C=C aromatic ring |
1600 | | C=C stretching mode unconjugated alkene |