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Top: resonance Raman spectra of 1 prepared with H2O2 (black line) or H218O2 (red line) and obtained with λexc = 647.1 nm. Bottom: resonance Raman spectra of 2 prepared with H2O2 (black line) or H2 18O2 (red line) and obtained with λexc = 514.5 nm.