| Vibration | amide I | amide II | amide III |
|---|---|---|---|
| position | 1658 cm−1 | 1543 cm−1 | 1451 cm−1 |
| width | 46 cm−1 | 46 cm−1 | 43 cm−1 |
| extinction | 105,000−1cm−1 | 98,000 M−1cm−1 | 28,000 M−1cm−1 |
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