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The relationships of 15N chemical shifts of PSB in: (a) The all-trans isomer and (b) 13-cis isomer with the λmax. The linear relationships were as follows: for all-trans model, (λmax (nm)= –5.0872 δ (ppm)+1415.1); 13-cis model, (λmax (nm)= –4.6709 δ (ppm)+1341.3) [46]. 15N PSB chemical shift values of BR [48], KR2 [40], TR [50], and NpSRII [51] are recalibrated to the reference signal of 15NH4Cl.
