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Analogue of the Kaede chromophore is fluorescent in viscous solvent and crystal. (a) Chemical structures of the FP chromophore mimics in this work. (b) Relative brightness of fluorophores in glycerol. Calculation of brightness is shown in Table S1. (c) Crystal of 3 exhibits red fluorescence. (d) Planar structure of the fluorophore moiety of 3 in the crystal (the t-butyl group is omitted for simplicity).
