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The normalized UV-vis spectral changes of the photoinitiator in THF under xenon lamp exposure (I = 57 mW cm−2), (a): STX ([STX] = 2 × 10−4 mol/L = 0.19 g/L); (b): TX-B ([TX-B] = 2 × 10−4 mol/L). [STX] refers to the molar concentration of the ATX moiety.
