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Fig. 3. (A) 1H NMR spectra of p-4H2O (4 mM) in D2O under the light irradiation (λ > 380 nm, 70 mW cm−2) at 293 K. (B) kinetic profiles of p-4H2O (●) and d-4H2O (▲) under the light irradiation, where the ratio of proximal and distal isomers was estimated from peak areas at 9.17 ppm and 9.66 ppm, respectively.