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| N–H stretch | Carboxyl O–H stretch and aromatic/aliphatic C–H stretch | Carboxyl C O stretch | Aromatic C C stretch | |
|---|---|---|---|---|
| Form II | 3340.6 | 3090.5–2919.0 | 1621.5 | 1591.4 |
| 1578.3 | ||||
| 1401.2 | ||||
| Form III | 3343.4 | 3079.4–2919.4 | 1623.7 | 1592.5 |
| 1578.0 | ||||
| 1408.2 |
