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(A) Femtosecond IR transient absorption of carbonyl amide I region of dicysteine tetrazine in CD3OD at (blue) 4 ps, (purple) 10 ps, (red) 30 ps, (cyan) 50 ps. Kinetic trace of (B) bleach signal from amide I carbonyl at 1647 cm−1 and (C) transient absorption of photoproduct carbonyl at 1664 cm−1 from 0–35 ps.
