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1H-NMR spectra of the benzyl protons of (R)-2 after (a) 365 nm-irradiation, (b) 436 nm-irradiation. Conditions: CDCl3, 1 × 10−3 M, 300 MHz, 22 °C, Irradiation: 365 nm (10 mW/cm2, 500 s), 436 nm (10 mW/cm2, 500 s) in an NMR test tube (ϕ = 5 mm).
