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The time-dependent spectrum of the SCN transient absorption observed upon photolysis (355 nm excitation) of S,S-tetrazine tripeptide 21 to furnish bis-SCN tripeptide 22, measured at 2163 cm−1 from 0–100 ps. The raw data points are pictured in black with blue outline, while the exponential fit to data, with a time constant τ=56 ps, is shown by the green curve.
