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Absorption (solid traces; 10 µM solutions) and fluorescence emission (dashed traces; λexc = 370 nm; OD370 = 0.75) spectra of cycloadducts 5, 6, 7 and 11a in MeOH. Inset: Visual comparison of the fluorescence intensity of cycloadducts in MeOH with excitation at 365 nm.
